H. W. Lewis
Rev. Mod. Phys. 24, 241 (1952) - Published 1 October, 1952
L. C. Biedenharn, J. M. Blatt, and M. E. Rose
Rev. Mod. Phys. 24, 249 (1952) - Published 1 October, 1952
John M. Blatt and L. C. Biedenharn
Rev. Mod. Phys. 24, 258 (1952) - Published 1 October, 1952
R. T. Cox
Rev. Mod. Phys. 24, 312 (1952) - Published 1 October, 1952
F. Ajzenberg and T. Lauritsen
Rev. Mod. Phys. 24, 321 (1952) - Published 1 October, 1952
