Optical Gravitational Lensing Experiment OGLE-1999-BUL-32: the longest ever microlensing event - evidence for a stellar mass black hole?
Journal article published in 2002 by
Shude Mao,
Martin C. Smith,
P. Woźniak,
A. Udalski 
,
M. Szymański,
M. Kubiak,
G. Pietrzyński,
I. Soszyński,
K. Żebruń
,
M. Szymański,
M. Kubiak,
G. Pietrzyński,
I. Soszyński,
K. Żebruń
