Esin, Ann A.Narayan, RameshCui, WeiGrove, J. EricZhang, Shuang-Nan2019-09-221998Esin, Ann A., Ramesh Narayan, Wei Cui, J. Eric Grove, and Shuang‐Nan Zhang. 1998. “Spectral Transitions in Cygnus X‐1 and Other Black Hole X‐Ray Binaries.” The Astrophysical Journal 505 (2): 854–68. https://doi.org/10.1086/306186.0004-637X1538-4357http://nrs.harvard.edu/urn-3:HUL.InstRepos:41384915en-USSpectral Transitions in Cygnus X‐1 and Other Black Hole X‐Ray BinariesJournal Article2019-09-2210.1086/306186