1. 8 & 9;LC Biedenharn,1981
2. Louck, J.D.: J. Math. Math. Sci. 22, 745 (1999)
3. Schwinger, J.: On angular momentum. U. S. Atomic Energy Commission Report NYO-3071, 1952 (unpublished). In: Biedenharn, L.C., van Dam, H. (eds.) Quantum Theory of Angular Momentum, pp. 229–279. Academic Press, New York (1965)
4. Judd, B.R., Lister, G.M.S.: J. Phys. A 20, 3159 (1987)
5. Judd, B.R.: In: Gruber, B., Millman, R.S. (eds.) Symmetries in Science, pp. 151–160. Plenum, New York (1980)