Ultraluminous X-ray sources in nearby galaxies: Clues on their nature from X-ray timing and new optical data
Proceedings article published in 2006 by
L. Zampieri,
P. Mucciarelli,
R. Falomo 
,
P. Casella,
T. Belloni,
R. Turolla,
A. Treves,
P. Ranalli
,
P. Casella,
T. Belloni,
R. Turolla,
A. Treves,
P. Ranalli
