1. J. D. Hind:Nuovo Cimento,4 A, 71 (1971).
2. R. Hermann:Algebraic, and geometric structures in current algebra theory, Princeton preprint (1970).
3. R. Hermann:Fourier Analysis on Groups and Partial Wave Analysis (New York, 1969), p. 231.
4. For example,O. Loos:Symmetric Spaces, Vol.1, Chap. 1 (New York, 1969).
5. K. J. Barnes andP. H. Dondi:Nucl. Phys.,25 B, 218 (1971).