Importante! Sobre el catálogo
| 1. | 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 / edited by E. Ye. Khachikian, K.J. Fricke, and J. Melnick. | 1987 | Libro |
006.108
|
| 2. | Quasars : proceedings of the 119th Symposium of the International Astronomical Union, held in Bangalore, India, December 2-6, 1985 / edited by G. Swarup and V.K. Kapahi. | 1986 | Libro |
006.106
|