@article{4800,
  author = {W.-R. Hamann and G. Dunnebeil and L. Koesterke and Werner Schmutz and U. Wessolowski},
  title = {Spectral analyses of Wolf-Rayet stars: hydrogen abundances in WN subtypes},
  year = {1991},
  journal = {Astronomy and Astrophysics},
  volume = {249},
  pages = {443-454},
  url = {http://articles.adsabs.harvard.edu/full/1991A\%26A...249..443H},
  note = {JILA Pub. 4471},
}