I. I. Rabi, N. F. Ramsey, and J. Schwinger

Rev. Mod. Phys. 26, 167 (1954) - Published 1 April, 1954

J. G. Daunt and R. S. Smith

Rev. Mod. Phys. 26, 172 (1954) - Published 1 April, 1954

Charles A. Domenicali

Rev. Mod. Phys. 26, 237 (1954) - Published 1 April, 1954