@article{10240,
  author = {Peter Conti and V. Niemela},
  title = {A Change in the Optical Spectrum of Zeta Puppis},
  year = {1976},
  journal = {Astrophysical Journal Letters},
  volume = {209},
  pages = {L37 - L38},
  month = {10/1976},
  url = {http://adsabs.harvard.edu/full/1976ApJ...209L..37C},
  doi = {10.1086/182261},
  note = {JILA Pub. 1475},
}