@article{9350,
  author = {B. Paczynski},
  title = {Evolution of Single Stars. II. Core Helium Burning in Population I Stars},
  year = {1970},
  journal = {Acta Astronomica},
  volume = {20},
  chapter = {195},
  pages = {195-212},
  url = {http://articles.adsabs.harvard.edu/full/1970AcA....20..195P},
  note = {JILA Pub. 758},
}