https://catalogue-scientifique.canada.ca/record=1959929~S6*frc
Rechercher Hill, Graham; Rechercher Brosterhus, Elmar B. F; Rechercher Hilditch, R. W; Rechercher Morris, S. C; Rechercher Pfannenschmidt, E. L; Rechercher Younger, Frank
National Research Council of Canada, Dominion Astrophysical Observatory, 1980
Publication gouvernementale