B. Observatory

Optically bright active galactic nuclei in the ROSAT-Faint source catalogue

Armenia, F.-J. Zickgraf, Germany, 2003, astro-ph/0312116.

Spectral Observations of Faint Markarian Galaxies of the Second Byurakan Survey. II.

Armenia, Russia., Luis Carrasco, 1997, astro-ph/9711112.