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See detailThe Gaia-ESO Public Spectroscopic Survey
Gilmore, G.; Randich, S.; Asplund, M. et al

in The Messenger (2012), 147

The Gaia-ESO Public Spectroscopic Survey has begun and will obtain high quality spectroscopy of some 100000 Milky Way stars, in the field and in open clusters, down to magnitude 19, systematically ... [more ▼]

The Gaia-ESO Public Spectroscopic Survey has begun and will obtain high quality spectroscopy of some 100000 Milky Way stars, in the field and in open clusters, down to magnitude 19, systematically covering all the major components of the Milky Way. This survey will provide the first homogeneous overview of the distributions of kinematics and chemical element abundances in the Galaxy. The motivation, organisation and implementation of the Gaia-ESO Survey are described, emphasising the complementarity with the ESA Gaia mission. Spectra from the very first observing run of the survey are presented. [less ▲]

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See detailThe gaia-ESO survey and massive stars
Blomme, R.; Fremat, Y.; Gosset, Eric ULg et al

in IAU Symposium 307 (2014)

As part of the Gaia-ESO Survey (GES), a number of clusters will be observed that were chosen speci cally for their massive-star content. We report on the procedures we followed to determine the stellar ... [more ▼]

As part of the Gaia-ESO Survey (GES), a number of clusters will be observed that were chosen speci cally for their massive-star content. We report on the procedures we followed to determine the stellar parameters from the massive-star spectra of this survey. We intercompare the results from the di erent techniques used by the nodes of our group to determine these parameters and discuss some of the problems encountered. We present preliminary results for NGC 6705, NGC 3293, and Trumpler 14. We study microturbulence in A-type stars, we use the repeat observation to investigate binarity, and we determine cluster membership from the radial velocity information. The large number of massive-star spectra obtained by the Gaia-ESO Survey will allow us to critically test stellar evolution modelling [less ▲]

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See detailThe Gaia-ESO Survey: CNO abundances in the open clusters Trumpler 20, NGC 4815, and NGC 6705
Tautvaišienė, G.; Drazdauskas, A.; Mikolaitis, Š. et al

in Astronomy and Astrophysics (2015), 573

Context. The Gaia-ESO Public Spectroscopic Survey will observe a large sample of clusters and cluster stars, covering a wide age-distance-metallicity-position-density parameter space. <BR /> Aims: We aim ... [more ▼]

Context. The Gaia-ESO Public Spectroscopic Survey will observe a large sample of clusters and cluster stars, covering a wide age-distance-metallicity-position-density parameter space. <BR /> Aims: We aim to determine C, N, and O abundances in stars of Galactic open clusters of the Gaia-ESO survey and to compare the observed abundances with those predicted by current stellar and Galactic evolution models. In this pilot paper, we investigate the first three intermediate-age open clusters. <BR /> Methods: High-resolution spectra, observed with the FLAMES-UVES spectrograph on the ESO VLT, were analysed using a differential model atmosphere method. Abundances of carbon were derived using the C[SUB]2[/SUB] band heads at 5135 and 5635.5 Å. The wavelength interval 6470-6490 Å, with CN features, was analysed to determine nitrogen abundances. Oxygen abundances were determined from the [O i] line at 6300 Å. <BR /> Results: The mean values of the elemental abundances in Trumpler 20 as determined from 42 stars are: [ Fe/H ] = 0.10 ± 0.08 (s.d.), [ C/H ] = -0.10 ± 0.07, [ N/H ] = 0.50 ± 0.07, and consequently C/N = 0.98 ± 0.12. We measure from five giants in NGC 4815: [ Fe/H ] = -0.01 ± 0.04, [ C/H ] = -0.17 ± 0.08, [ N/H ] = 0.53 ± 0.07, [ O/H ] = 0.12 ± 0.09, and C/N = 0.79 ± 0.08. We obtain from 27 giants in NGC 6705: [ Fe/H ] = 0.0 ± 0.05, [ C/H ] = -0.08 ± 0.06, [ N/H ] = 0.61 ± 0.07, [ O/H ] = 0.13 ± 0.05, and C/N = 0.83 ± 0.19. The C/N ratios of stars in the investigated open clusters were compared with the ratios predicted by stellar evolutionary models. For the corresponding stellar turn-off masses from 1.9 to 3.3 M[SUB]⊙[/SUB], the observed C/N ratio values are very close to the predictions of standard first dredge-up models as well as to models of thermohaline extra-mixing. They are not decreased as much as predicted by the recent model in which the thermohaline- and rotation-induced extra-mixing act together. The average [O/H] abundance ratios of NGC 4815 and NGC 6705 are compared with the predictions of two Galactic chemical evolution models. The data are consistent with the evolution at the solar radius within the errors. <BR /> Conclusions: The first results of CNO determinations in open clusters show the potential of the Gaia-ESO Survey to judge stellar and Galactic chemical evolution models and the validity of their physical assumptions through a homogeneous and detailed spectral analysis. Based on data products from observations made with ESO Telescopes at the La Silla Paranal Observatory under programme ID 188.B-3002 (The Gaia-ESO Public Spectroscopic Survey, PIs G. Gilmore and S. Randich). [less ▲]

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See detailThe Gaia-ESO Survey: pre-main-sequence stars in the young open cluster NGC 3293
Delgado, A. J.; Sampedro, L.; Alfaro, E. J. et al

in Monthly Notices of the Royal Astronomical Society (2016), 460

The young open cluster NGC3293 is included in the observing program of the Gaia-ESO survey (GES). The radial velocity values provided have been used to assign cluster membership probabilities by means of ... [more ▼]

The young open cluster NGC3293 is included in the observing program of the Gaia-ESO survey (GES). The radial velocity values provided have been used to assign cluster membership probabilities by means of a single-variable parametric analysis. These membership probabilities are compared to the results of the photometric membership assignment of NGC3293, based on UBVRI photometry. The agreement of the photometric and kinematic member samples amounts to 65 per cent, and could increase to 70 per cent as suggested by the analysis of the differences between both samples. A number of photometric PMS candidate members of spectral type F are found, which are confirmed by the results from VPHAS photometry and SED fitting for the stars in common with VPHAS and GES data sets. Excesses at mid- and near-infrared wavelengths, and signs of Hα emission, are investigated for them. Marginal presence of Hα emission or infilling is detected for the candidate members. Several of them exhibit moderate signs of U excess and weak excesses at mid-IR wavelengths. We suggest that these features originate from accretion discs in their last stages of evolution. [less ▲]

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See detailThe Gaia-ESO Survey: revisiting the Li-rich giant problem
Casey, A. R.; Ruchti, G.; Masseron, T. et al

in Monthly Notices of the Royal Astronomical Society (2016), 461

The discovery of lithium-rich giants contradicts expectations from canonical stellar evolution. Here we report on the serendipitous discovery of 20 Li-rich giants observed during the Gaia-ESO Survey ... [more ▼]

The discovery of lithium-rich giants contradicts expectations from canonical stellar evolution. Here we report on the serendipitous discovery of 20 Li-rich giants observed during the Gaia-ESO Survey, which includes the first nine Li-rich giant stars known towards the CoRoT fields. Most of our Li-rich giants have near-solar metallicities and stellar parameters consistent with being before the luminosity bump. This is difficult to reconcile with deep mixing models proposed to explain lithium enrichment, because these models can only operate at later evolutionary stages: at or past the luminosity bump. In an effort to shed light on the Li-rich phenomenon, we highlight recent evidence of the tidal destruction of close-in hot Jupiters at the sub-giant phase. We note that when coupled with models of planet accretion, the observed destruction of hot Jupiters actually predicts the existence of Li-rich giant stars, and suggests that Li-rich stars should be found early on the giant branch and occur more frequently with increasing metallicity. A comprehensive review of all known Li-rich giant stars reveals that this scenario is consistent with the data. However, more evolved or metal-poor stars are less likely to host close-in giant planets, implying that their Li-rich origin requires an alternative explanation, likely related to mixing scenarios rather than external phenomena. [less ▲]

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See detailThe Gaia-ESO Survey: Sodium and aluminium abundances in giants and dwarfs. Implications for stellar and Galactic chemical evolution
Smiljanic, R.; Romano, D.; Bragaglia, A. et al

in Astronomy and Astrophysics (2016), 589

Context. Stellar evolution models predict that internal mixing should cause some sodium overabundance at the surface of red giants more massive than ~1.5-2.0 M[SUB]⊙[/SUB]. The surface aluminium abundance ... [more ▼]

Context. Stellar evolution models predict that internal mixing should cause some sodium overabundance at the surface of red giants more massive than ~1.5-2.0 M[SUB]⊙[/SUB]. The surface aluminium abundance should not be affected. Nevertheless, observational results disagree about the presence and/or the degree of Na and Al overabundances. In addition, Galactic chemical evolution models adopting different stellar yields lead to very different predictions for the behavior of [Na/Fe] and [Al/Fe] versus [Fe/H]. Overall, the observed trends of these abundances with metallicity are not well reproduced. <BR /> Aims: We readdress both issues, using new Na and Al abundances determined within the Gaia-ESO Survey. Our aim is to obtain better observational constraints on the behavior of these elements using two samples: i) more than 600 dwarfs of the solar neighborhood and of open clusters and ii) low- and intermediate-mass clump giants in six open clusters. <BR /> Methods: Abundances were determined using high-resolution UVES spectra. The individual Na abundances were corrected for nonlocal thermodynamic equilibrium effects. For the Al abundances, the order of magnitude of the corrections was estimated for a few representative cases. For giants, the abundance trends with stellar mass are compared to stellar evolution models. For dwarfs, the abundance trends with metallicity and age are compared to detailed chemical evolution models. <BR /> Results: Abundances of Na in stars with mass below ~2.0 M[SUB]⊙[/SUB], and of Al in stars below ~3.0 M[SUB]⊙[/SUB], seem to be unaffected by internal mixing processes. For more massive stars, the Na overabundance increases with stellar mass. This trend agrees well with predictions of stellar evolutionary models. For Al, our only cluster with giants more massive than 3.0 M[SUB]⊙[/SUB], NGC 6705, is Al enriched. However, this might be related to the environment where the cluster was formed. Chemical evolution models that well fit the observed [Na/Fe] vs. [Fe/H] trend in solar neighborhood dwarfs cannot simultaneously explain the run of [Al/Fe] with [Fe/H], and vice versa. The comparison with stellar ages is hampered by severe uncertainties. Indeed, reliable age estimates are available for only a half of the stars of the sample. We conclude that Al is underproduced by the models, except for stellar ages younger than about 7 Gyr. In addition, some significant source of late Na production seems to be missing in the models. Either current Na and Al yields are affected by large uncertainties, and/or some important Galactic source(s) of these elements has as yet not been taken into account. Based on observations made with the ESO/VLT, at Paranal Observatory, under program 188.B-3002 (The Gaia-ESO Public Spectroscopic Survey), and on data obtained from the ESO Archive originally observed under programs 60.A-9143, 076.B-0263 and 082.D-0726.Table 1 is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/589/A115">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/589/A115</A> [less ▲]

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See detailThe Gaia-ESO Survey: The analysis of high-resolution UVES spectra of FGK-type stars
Smiljanic, R.; Korn, A. J.; Bergemann, M. et al

in Astronomy and Astrophysics (2014), 570

Context. The ongoing Gaia-ESO Public Spectroscopic Survey is using FLAMES at the VLT to obtain high-quality medium-resolution Giraffe spectra for about 10[SUP]5[/SUP] stars and high-resolution UVES ... [more ▼]

Context. The ongoing Gaia-ESO Public Spectroscopic Survey is using FLAMES at the VLT to obtain high-quality medium-resolution Giraffe spectra for about 10[SUP]5[/SUP] stars and high-resolution UVES spectra for about 5000 stars. With UVES, the Survey has already observed 1447 FGK-type stars. <BR /> Aims: These UVES spectra are analyzed in parallel by several state-of-the-art methodologies. Our aim is to present how these analyses were implemented, to discuss their results, and to describe how a final recommended parameter scale is defined. We also discuss the precision (method-to-method dispersion) and accuracy (biases with respect to the reference values) of the final parameters. These results are part of the Gaia-ESO second internal release and will be part of its first public release of advanced data products. Methods: The final parameter scale is tied to the scale defined by the Gaia benchmark stars, a set of stars with fundamental atmospheric parameters. In addition, a set of open and globular clusters is used to evaluate the physical soundness of the results. Each of the implemented methodologies is judged against the benchmark stars to define weights in three different regions of the parameter space. The final recommended results are the weighted medians of those from the individual methods. Results: The recommended results successfully reproduce the atmospheric parameters of the benchmark stars and the expected T[SUB]eff[/SUB]-log g relation of the calibrating clusters. Atmospheric parameters and abundances have been determined for 1301 FGK-type stars observed with UVES. The median of the method-to-method dispersion of the atmospheric parameters is 55 K for T[SUB]eff[/SUB], 0.13 dex for log g and 0.07 dex for [Fe/H]. Systematic biases are estimated to be between 50-100 K for T[SUB]eff[/SUB], 0.10-0.25 dex for log g and 0.05-0.10 dex for [Fe/H]. Abundances for 24 elements were derived: C, N, O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Mo, Ba, Nd, and Eu. The typical method-to-method dispersion of the abundances varies between 0.10 and 0.20 dex. Conclusions: The Gaia-ESO sample of high-resolution spectra of FGK-type stars will be among the largest of its kind analyzed in a homogeneous way. The extensive list of elemental abundances derived in these stars will enable significant advances in the areas of stellar evolution and Milky Way formation and evolution. Based on observations made with the ESO/VLT, at Paranal Observatory, under program 188.B-3002 (The Gaia-ESO Public Spectroscopic Survey, PIs Gilmore and Randich). Appendices are available in electronic form at <A href="http://www.aanda.org/10.1051/0004-6361/201423937/olm">http://www.aanda.org</A> [less ▲]

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See detailGail Jones, Cinq Carillons
Belleflamme, Valérie-Anne ULg

Article for general public (2015)

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See detailGail Jones, Pardon
Belleflamme, Valérie-Anne ULg

Article for general public (2015)

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See detailGAIMS: a powerful gait analysis system satisfying the constraints of clinical routine
Pierard, Sébastien ULg; PHAN BA, Remy ULg; DELVAUX, Valérie ULg et al

in Multiple Sclerosis Journal (2013, October), 19(S1), 359

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See detailGAIMS: A Reliable Non-Intrusive Gait Measuring System
Pierard, Sébastien ULg; Azrour, Samir ULg; PHAN BA, Remy ULg et al

in ERCIM News (2013), 95

Gait observation and analysis can provide invaluable information about an individual [1]. Studies that have interpreted gait using traditional imaging devices have demonstrated that it is difficult to ... [more ▼]

Gait observation and analysis can provide invaluable information about an individual [1]. Studies that have interpreted gait using traditional imaging devices have demonstrated that it is difficult to make reliable measurements with colour cameras. GAIMS, our new system resulting from a multidisciplinary project born from collaboration between engineers and neurologists, aims at developing non-intrusive and reliable tools to provide quantitative measures of gait and interpretations of the acquired data. Following a current trend in imaging, it takes advantage of imaging sensors that measure distance instead of colour. While its principles are general, GAIMS is currently used for the diagnosis of multiple sclerosis (MS) and the continued evaluation of disease progression [2]. It is the first available system to fully satisfy the clinical routine and its associated constraints. [less ▲]

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See detailGAIMS: a tool specifically developed for the clinical gait analysis of patients with multiple sclerosis
Pierard, Sébastien ULg; Phan-Ba, Rémy; Giet, Amaury et al

in Multiple Sclerosis Journal (2015, April), 21(4), 498-499

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See detailGain Adaptation for Continuous Sliding Mode Control
Cho, Hancheol ULg

in 2016 2nd International Conference on Control Science and Systems Engineering (ICCSSE), Singapore 27-29 July 2016 (2016)

In this paper a novel adaptive sliding mode controller design is presented for robust control of nonlinear uncertain systems. A continuous control law to compensate for the uncertainties is first ... [more ▼]

In this paper a novel adaptive sliding mode controller design is presented for robust control of nonlinear uncertain systems. A continuous control law to compensate for the uncertainties is first developed that is completely free from chattering. Focusing on the relation between the tried gain value and the resultant sliding variable, a new method for estimating the uncertainty bounds is then derived, leading to an adaptive law for gain-tuning by which the error eventually lies within a user-specified region in a finite time. Unlike other existing approaches, the new adaptive rule only requires the magnitude of the control input in the previous time step, which greatly eases the application of the proposed algorithm to real-world systems. An inverted pendulum system is simulated to demonstrate the accuracy and effectiveness of the proposed control strategy. [less ▲]

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See detailGain baro-réflexe calculé lors d’un test d’orthostatisme (« squatting ») : reproductibilité et effet de l’âge dans une population normale
PHILIPS, Jean-Christophe ULg; MARCHAND, Monique ULg; Estrella, F. et al

in Archives des Maladies du Coeur et des Vaisseaux (2004), 97(suppl), 5392

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See detailGain-of-function of mutant p53: mutant p53 enhances cancer progression by inhibiting KLF17 expression in invasive breast carcinoma cells.
Ali, Amjad ULg; Shah AS; Ahmad A

in Cancer Letters (2014)

Kruppel-like-factor 17 (KLF17) is a negative regulator of metastasis and epithelial-mesenchymal-transition (EMT). However, its expression is downregulated in metastatic breast cancer that contains p53 ... [more ▼]

Kruppel-like-factor 17 (KLF17) is a negative regulator of metastasis and epithelial-mesenchymal-transition (EMT). However, its expression is downregulated in metastatic breast cancer that contains p53 mutations. Here, we show that mutant-p53 plays a key role to suppress KLF17 and thereby enhances cancer progression, which defines novel gain-of-function (GOF) of mutant-p53. Mutant-p53 interacts with KLF17 and antagonizes KLF17 mediated EMT genes transcription. Depletion of KLF17 promotes cell viability, decreases apoptosis and induces drug resistance in metastatic breast cancer cells. KLF17 suppresses cell migration and invasion by decreasing CD44, PAI-1 and Cyclin-D1 expressions. Taken together, our results show that KLF17 is important for the suppression of metastasis and could be a potential therapeutic target during chemotherapy. [less ▲]

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See detailGain-scheduled, model-based anti-windup for LPV systems
Forni, Fulvio ULg; Galeani, Sergio

in Automatica (2010), 46(1), 222-225

The aim of this paper is to show that a recently proposed technique for anti-windup control of exponentially unstable plants can be easily extended to solve the corresponding robust anti-windup problem ... [more ▼]

The aim of this paper is to show that a recently proposed technique for anti-windup control of exponentially unstable plants can be easily extended to solve the corresponding robust anti-windup problem for linear parameter varying systems, for which the time varying parameters are measured online. The proposed technique is minimally conservative with respect to the size of the resulting operating region (which coincides, up to an arbitrarily small quantity, with the largest set on which asymptotic stability can be guaranteed for the considered plant with the given saturation level and uncertainty characteristics), and is not limited to plants having only small uncertainties or being open-loop stable. [less ▲]

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See detailGainers and losers of the implementation of the new Common Agricultural Policy in Wallonia
Burny, Philippe ULg; Terrones Gavira, François ULg

in Agriculture and Agricultural Science Procedia (2015), 7

The new Common Agricultural Policy (CAP) defined in 2013 is implemented since 2015. It offers several options to the Member States/Regions. This paper describes the choices which have been made in ... [more ▼]

The new Common Agricultural Policy (CAP) defined in 2013 is implemented since 2015. It offers several options to the Member States/Regions. This paper describes the choices which have been made in Wallonia and their consequences on direct payments. It appears that 42% of the farmers will lose between 2014 and 2019, while 44% will gain and a quasi-status quo is observed for the remaining 14%. Finally, the new situation is politically acceptable and gives more support to small farms, young farmers and cattle breeders, though the global envelope for direct payments will decline in Wallonia. [less ▲]

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See detailGaining speed in molecular dynamics simulations by implicit representation of water and membrane molecules
Steinhauer, Sven ULg; Crowet, Jean-Marc ULg; Brasseur, Robert ULg et al

Poster (2013, June 19)

Molecular dynamics (MD) is an appropriate method for investigation of peptide-membrane systems and helps in analyzing results from experiments. In many cases, the ability of viral fusion proteins and ... [more ▼]

Molecular dynamics (MD) is an appropriate method for investigation of peptide-membrane systems and helps in analyzing results from experiments. In many cases, the ability of viral fusion proteins and toxins for destabilizing the membrane is due to their hydrophobic profile, leading to particular membrane insertion. By now, many relevant processes for drug design, toxicological studies and other fields of application, are not feasible by MD simulations, when each atom is represented over time. Processes such as protein folding, often take place above the time scales reachable by MD simulations, which are of the order of micro seconds. The necessary time effort for carrying out such simulations stays considerable and depends mainly on (1) the complexity of the simulated system (2) the simulated time scale (3) the simulation method (4) the efficiency of used hardware and software algorithms. Nowadays, MD simulations can still take weeks of calculation on high end computers. Impala is an implicit water and lipids forcefield, initially developed by our laboratory. Implicit forcefields replace water and/or lipid molecules by a couple of simple and partially precalculable equations. Using this method, thousands of water and lipid molecules can be replaced in MD simulations using Gromacs software. This leads to a considerable reduction of system complexity. The original Impala algorithm based on the assumption of rigid peptides and used a Monte Carlo algorithm with the aim of finding the insertion characteristics of these molecules in membranes. Our current work is the integration of the Impala forcefield into Gromacs, a freely accessible MD software. Replacing the aqueous and lipid phase atomic description in Gromacs MD by an implicit forcefield is supposed to lead to a gain of speed compared to full atomistic simulations. A gain of precision compared to Impala is expected, too. This will be achieved by turning molecules flexible, when implementing Impala into Gromacs. [less ▲]

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See detailGains d’efficience : La Cour AELE, peu sensible à l’approche économique, rejette le pourvoi de la poste norvégienne, condamnée à 12 millions d’euros d’amendes pour avoir empêché l’accès d’entreprises concurrentes au marché de la distribution de colis aux particuliers
Sibony, Anne-Lise ULg

in Concurrences : Revue des Droits de la Concurrence (2012), 4

Cour AELE, 18 avril 2012, Posten Norge/Autorité AELE, aff. E-15/10 Gains d’efficience : La Cour AELE, peu sensible à l’approche économique, rejette le pourvoi de la poste norvégienne, condamnée à 12 ... [more ▼]

Cour AELE, 18 avril 2012, Posten Norge/Autorité AELE, aff. E-15/10 Gains d’efficience : La Cour AELE, peu sensible à l’approche économique, rejette le pourvoi de la poste norvégienne, condamnée à 12 millions d’euros d’amendes pour avoir empêché l’accès d’entreprises concurrentes au marché de la distribution de colis aux particuliers. [less ▲]

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See detailGaio, l'insegnamento e il Belgio
Gerkens, Jean-François ULg

Conference (2012, June 11)

What was the impact of the discovery of the Veronese Palimpsest on the teaching methods in Belgium?

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