@article{9351,
  author = {B. Paczynski},
  title = {Evolution of Single Stars III. Stationary Shell Sources},
  year = {1970},
  journal = {Acta Astronomica},
  volume = {20},
  chapter = {287},
  pages = {287-309},
  url = {http://articles.adsabs.harvard.edu/full/1970AcA....20..287P},
  note = {JILA Pub. 757},
}