TY - JOUR
AU - John Cox
BT - The Astrophysical Journal
DA - Jan-11-1963
DO - 10.1086/147661
PY - 1963
EP - 487
T2 - The Astrophysical Journal
TI - On Second Helium Ionization as a Cause of Pulsational Instability in Stars.
UR - http://articles.adsabs.harvard.edu/full/1963ApJ...138..487C
VL - 138
SN - 0004-637X
ER -