@article{4531,
  author = {D. Baade and Werner Schmutz and M. van Kerkwijk},
  title = {Short-term activity in the Gamma(2) Velorum system - The O-type supergiant is a nonradially pulsating star},
  year = {1990},
  journal = {Astronomy and Astrophysics},
  volume = {240},
  pages = {105-115},
  url = {http://articles.adsabs.harvard.edu/full/1990A\%26A...240..105B},
  note = {JILA Pub. 4224},
}