Importante! Sobre el catálogo
| 1. | Active galactic nuclei : proceedings of the 134th Symposium of the International Astronomical Union, held in Santa Cruz, California, August 15-19, 1988 / edited by Donald E. Osterbrock and Joseph S. Miller. | 1989 | Libro |
006.121
|
| 2. | 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
|