Max Calvani's

for an update see

"Line emission from accretion discs around rotating black holes: the analytic approach"
Andrej Čadež, Claudio Fanton, Massimo Calvani
 New Astronomy, 1998, vol. 3, no. 8, p. 647-654

Here is the postscript file
Accretion disc: the films
Accretion disc: the line profiles
1) angular momentum of B.H.: 1.mpg 1) R_out = 15 M:
2) observer's inclination angle: 2.mpg 2) R_out = 30
3) ghost image                      : 3.mpg 3) R_out = 50 M:

"Detecting accretion disks in active galactic nuclei"
Claudio Fanton, Massimo Calvani, Fernando de Felice, Andrej 
Publ. of the Astronomical Society of Japan, 1997, vol. 49, p.159-169

Image of an accretion disk as seen from infinity. Left: non-rotating black hole. Right:   rotating black hole. The frequency shift is shown for different viewing angles.

Image of an accretion disk around a black hole: the disk  temperature.

Image of an accretion disk around a black hole: composite picture that shows also the secondary (ghost) image.  

Massimo Calvani and Jack Sulentic found a quasar in Spain!