BATSCHELET, E. 1981. Circular statistics in biology. Academic Press, London. 371 pp.
BOGAERT, J. 1996. Quantification of vegetation fragments in the landscape using G.I.S. techniques. University of Ghent, Faculty of Agricultural and Applied Biological Sciences. 108 pp. (in Dutch).
BOGAERT, J. & IMPENS, I. 1998. An improvement on area-perimeter ratios for interior-edge evaluation of habitats. Pp. 55-61 in Proceedings of the 10th Portuguese conference on pattern recognition. Lisbon.
BROKAW, N. V. L. 1982. The definition of treefall gap and the effect on measures of forest dynamics. Biotropica 14:158-160.
BROKAW, N. V. L. 1985. Treefalls, regrowth, and community structure in tropical rainforests. Pp. 53-69 in Pickett, S.T.A. & White, P.S. (eds). The ecology of natural disturbance and patch dynamics. Academic Press, London.
CID 1997. CID-100 Digital plant canopy imager. Instruction manual. CID Inc., Vancouver. 18 pp.
DENSLOW, J. S. 1987. Tropical rainforest gaps and tree species diversity. Annual Review of Ecology and Systematics 18:431-51.
JACOBS, M. 1981. The tropical rain forest - a first encounter. Springer-Verlag, Berlin. 295 pp.
MARDIA, K. V. 1976. Linear-circular correlation coefficients and rhytmometry. Biometrika 63:403-405.
OLSEN, E. R., RAMSEY, R.D. & WINN, D.S. 1993. A modified fractal dimension as a measure of landscape diversity. Photogrammetric Engineering and Remote Sensing 59:1517-1520.
POULSON T. L. & PLATT, W. J. 1989. Gap light regimes influence canopy tree diversity. Ecology 70:553-555.
RAICH, J. R. 1989. Seasonal and spatial variation in the light environment in a tropical dipterocarp forest and gaps. Biotropica 21:299-302.
TERBORGH, J. 1985. The vertical component of plant species diversity in temperate and tropical forests. American Naturalist 126:760-776.
