1. For a review see A. Böhm and Y. Ne’eman, “Twenty Years of Dynamical Groups and Spectra Generating Algebras”, in Proceedings of the International Conference on Group Theoretical Methods in Physics, Yurmula, U.S.S.R. (1985), V. Manko ed., VNU Publishers, Netherlands (1986). See also Refs. 1–6 in Ref. 8.
2. A. Böhm, Nuovo Cimento 43, 665 (1966);
3. M. Bander and C. Itzykson, Res. Mod. Phys. 38, 346 (1966).
4. W. Pauli, Z. Phyzik 36, 336 (1926).
5. Y. Alhassid, F. Gürsey and F. Iachello, Phys. Rev. Lett. 50, 873 (1983);