D. Ter Haar
Rev. Mod. Phys. 22, 119 (1950) - Published 1 April, 1950
Ralph A. Alpher and Robert C. Herman
Rev. Mod. Phys. 22, 153 (1950) - Published 1 April, 1950
H. A. Bethe
Rev. Mod. Phys. 22, 213 (1950) - Published 1 April, 1950
