• [1]

    A. Anima ands F. Iachello, Ann. Phys.,99(1976), 253.[2] A. Anima and F. Iachello, Ann. Phys., 111 (1978), 201.[3] A. Anima and F. Iachello, Ann. Phys., 123(1979), 468.[4] O. Castanoe, E. Cliac6n, A. Frank and M. Moshinekv, J. Math.Phys, 211(1970), 35[5] R. F. Gasbem and J.A. Cizewski, Nucl. Phys., A309(1978), 477.[6] L. Richter, H. Backs, F. Weik and R. Willwater, Nucl.Phys.,A319(1979), 221.