@article{9910,
  author = {Harding Smith and B. Margon and Peter Conti},
  title = {Spectroscopic Observations of the Cygnus X-1 Optical Candidate},
  year = {1973},
  journal = {The Astrophysical Journal},
  volume = {179},
  pages = {L125},
  month = {Jan-01-1973},
  issn = {0004-637X},
  url = {http://adsabs.harvard.edu/full/1973ApJ...179L.125S},
  doi = {10.1086/181132},
}