• [1]

    A. Arima and F. Iachello, Anna fo Phys., 111(1978), 201.[2] J. P. Ellrott, Proc Roy Soc Sera, 245(1958), 238; 245(1958), 562.[3] S. Coleman, Joun. Math. Phys., 5(1964), 1343.[4] Nuclear Data Sheets, 24 No. 1 (1977).[5] A. B. Balantekin, L. Bars and F. Iachello, Nuclear Phys., A370(1981), 284.