@article{4636,
  author = {Werner Schmutz and W. Vacca},
  title = {Determinations of the interstellar reddening toward Wolf-Rayet stars of the nitrogen sequence from observed ubv color indices},
  year = {1991},
  journal = {Astronomy and Astrophysics Supplement Series},
  volume = {89},
  pages = {259-284},
  url = {http://adsabs.harvard.edu/full/1991A\%26AS...89..259S},
  note = {JILA Pub. 4387},
}