-
[1]
Arima and Iachello, Phys. Rev. Lett. 35(1975), 1069; Ann. Phys., 99(1976), 253; 111 (1978), 201.[2] E. B. Dynkin, Marh. Sb., 30(1952), 349; Amer. Math. Soc. Transl, [Z] , 6(1967), 111.[3] B. Gruber and M. T. Samuel, in Group Theory and its Applications, Vol. 111, EM Loebl (Ed.) (AcademicPress, NEW York, 1975).[4] M. Lorentc and B. Gruber, J. Math. Phys., 13(1972), 1639.[5] B. Gruber and M. T. Samuel, Kinam, 2(1980), 133.