1. E. P. Wigner:Group Theory and its Application to the Quantum Mechanics of Atomic Spectra, Chapter 15 (New York, 1959) (translated byJ. J. Griffin).
2. A. R. Edmonds:Angular Momentum in Quantum Mechanics (Princeton, 1957).
3. G. Szegö:Orthogonal Polynomials (Amer. Math. Soc. Colloquium Publications, vol. XXIII) rev. ed. (1959).
4. H. E. Moses:The transformation from a linear momentum to an angular momentum basis for particles of zero mass and finite spin, inJourn. Math. Phys., in press.
5. M. Jacob andG. C. Wick:Ann. of Phys.,7, 414 (1959).