M. M. De Robertis

Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. IX. Ultraviolet Observations of Fairall 9

Claudia Winge, Gerard A. Kriss, Bradley M. Peterson, 1997 .

The Central Engines in Narrow-Line Seyfert 1 Galaxies

M. M. De Robertis, S. Virani, C. J. Ryan, 2004 .

A CCD Study of the Environment of Seyfert Galaxies. II. Testing the Interaction Hypothesis

H. K. C. Yee, M. M. De Robertis, K. Hayhoe, 1998 .

A CCD Study of the Environment of Seyfert Galaxies. III. Host Galaxies and the Nearby Environments

S. Virani, M. M. De Robertis, S. N. Virani, 2000, astro-ph/0007030.