W. R. Smythe
Rev. Mod. Phys. 20, 472 (1948) - Published 1 July, 1948
J. C. Slater
Rev. Mod. Phys. 20, 473 (1948) - Published 1 July, 1948
A. B. Arons and D. R. Yennie
Rev. Mod. Phys. 20, 519 (1948) - Published 1 July, 1948
Bruno Rossi
Rev. Mod. Phys. 20, 537 (1948) - Published 1 July, 1948
