M.C. Abreu, V. Berg, J. Qms, K. Heyde, M. Waroquier, P. Van Isacker, G. Wenes Nuclear Physics A 349 (3-4), 301-3081980A1Published while none of the authors were employed at the CMMDOI http://dx.doi.org/10.1016/0375-9474(80)90289-4