@article{9353,
  author = {John Castor and D. van Blerkom},
  title = {Excitation of he II in Wolf-Rayet Envelopes},
  year = {1970},
  journal = {The Astrophysical Journal},
  volume = {161},
  pages = {485},
  month = {Jan-09-1970},
  issn = {0004-637X},
  url = {http://adsabs.harvard.edu/full/1970ApJ...161..485C},
  doi = {10.1086/150554},
}