Optical observations of the black hole candidate XTE J1550-564 during the September/October 1998 outburst
Journal article published in 1999 by
C. Sánchez-Fernández,
A. J. Castro-Tirado,
H. W. Duerbeck,
L. Mantegazza,
Beckmann,
Burwitz,
L. Vanzi,
A. Bianchini,
M. della Valle 
,
A. Piemonte,
B. Dirsch,
I. Hook,
L. Yan,
A. Giménez
,
A. Piemonte,
B. Dirsch,
I. Hook,
L. Yan,
A. Giménez
