ISBN 9027724741 books & textbook
Observational Evidence of Activity in Galaxies: Proceedings of the 121st Symposium of the International Astronomical Union Held in Byurakan, Armenia, ... Astronomical Union Symposia, 121)
Khachikian, E.Ye. Fricke, K.J. Melnick, J.
Springer /1987-05-31 Paperback / 624 Pages
isbn-10: 9027724741 / isbn-13: 9789027724748
