1. E.P. Wigner, Gruppentheorie and ihre Anwendung auf die Quantenmechanik der Atomspektren, Vieweg, (1931).
2. G. Racah, Phys. Rev. 61, 186 (1942); ibid. 62, 438 (1942); ibid. 63, 367 (1943); ibid. 76, 1352 (1949).
3. M.E. Rose, Elementary Theory of Angular Momentum, Wiley, (1957).
4. A.R. Edmonds, Angular Momentum in Quantum Mechanics, Princeton University Press, (1957).
5. Oxford University Press;DM Brink,1962