@article{9104,
  author = {R. Humphreys and C. Leitherer and O. Stahl and B. Wolf and F.-J. Zickgraf},
  title = {Variable C: an S Doradus-type variable in M33},
  year = {1988},
  journal = {Astronomy and Astrophysics},
  volume = {203},
  pages = {306-316},
  url = {http://adsabs.harvard.edu/full/1988A\%26A...203..306H},
  note = {JILA Pub. 3802},
}