TY - JOUR AU - B. Paczynski BT - Acta Astronomica N1 - JILA Pub. 758 PY - 1970 SE - 195 SP - 195 EP - 212 T2 - Acta Astronomica TI - Evolution of Single Stars. II. Core Helium Burning in Population I Stars UR - http://articles.adsabs.harvard.edu/full/1970AcA....20..195P VL - 20 ER -