@article{9511,
  author = {G. Langer},
  title = {A note on models for the envelopes of long-period variable stars},
  year = {1971},
  journal = {Monthly Notices of the Royal Astronomical Society},
  volume = {155},
  chapter = {199},
  pages = {199-202},
  url = {http://adsabs.harvard.edu/full/1971MNRAS.155..199L},
  doi = {10.1093/mnras/155.2.199},
  note = {JILA Pub. 694},
}