Observational evidence of activity in galaxies proceedings of the 121st Symposium of the International Astronomical Union, held in Byurakan, Armenia, U.S.S.R., June 3-7, 1986
International Astronomical Union Symposium Bëiìurakan, Armenian S.S.R.) 1986 Khachikian, çE. E.; Klaus J Fricke; Jorge Melnick
Dordrecht Boston D. Reidel Norwell, MA, U.S.A. Sold and distributed in the U.S.A. and Canada by Kluwer Academic Publishers c1987
Supermassive black holes proceedings of the Third George Mason Astrophysics Workshop, held at George Mason University, Fairfax, Virginia, 14-16 October, 1986
George Mason Astrophysics Workshop 1986 George Mason University) (3rd Minas C Kafatos
Cambridge Cambridge University Press New York 1988