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See detailThe problems of the A-type stars
Struve, Otto; Swings, Polydore ULg

in Observatory (The) (1942), 64

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See detailThe origin of unidentified interstellar absorption lines
Swings, Polydore ULg; Öhman, Y.

in Observatory (The) (1939), 62

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See detailForbidden FeIII-lines in celestial spectra
Edlén, B.; Swings, Polydore ULg

in Observatory (The) (1939), 62

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