Astronomy and astrophysics - European Southern Observatory; Springer-Verlag; EDP Sciences (Springer-Verlag, 1969)
Keywords: Astronomy : Periodicals; Astrophysics : Periodicals; Astronomie : Périodiques; Astrophysique : Périodiques; 33.95 astrophysics; 39.00 astronomy: general; Astronomy; Astrophysics; Sterrenkunde; Astrofysica