by Bösch, B., Böhm, A., Wolf, C., Aragón-Salamanca, A., Barden, M., Gray, M. E., Ziegler, B. L., Schindler, S., Balogh, M.
Published in Astronomy and astrophysics (Berlin) (01.01.2013)

by Zasov, A. V., Moiseev, A. V., Khoperskov, A. V., Sidorova, E. A.
Published in Astronomy reports (01.02.2008)

by Lehmer, B. D, Brandt, W. N, Alexander, D. M, Bell, E. F, McIntosh, D. H, Bauer, F. E, Hasinger, G, Mainieri, V, Miyaji, T, Schneider, D. P, Steffen, A. T
Published in The Astrophysical journal (10.03.2007)

by Zasov, A V, Moiseev, A V, Khoperskov, A V, Sidorova, E A
Published in Astronomy reports (01.02.2008)

by Falcón-Barroso, Jesús, Bacon, Roland, Cappellari, Michele, Davies, Roger, de Zeeuw, P. Tim, Emsellem, Eric, Krajnović, Davor, Kuntschner, Harald, McDermid, Richard M., Peletier, Reynier F., Sarzi, Marc, van de Ven, Glenn
Published in Proceedings of the International Astronomical Union (01.12.2006)

by Ferreras, Ignacio, Yi, Sukyoung K.
Published in Monthly notices of the Royal Astronomical Society (01.06.2004)

by Zasov, A V, Moiseev, A V, Khoperskov, A V, Sidorova, E A
Published in arXiv.org (25.01.2008)

by Cannizzo, John K., Hollister, Timothy C.
Published in The Astrophysical journal (20.11.1992)