1. D. R. Inglis, Phys. Rev. 96, 1059 (1954); 97, 701 (1955); 103, 1786 (1956).
2. A. Bohr and B.R. Mottelson, K. Dan. Vidensk. Selsk. Mat.-Fys.Medd. 30, 1 (1955).
3. A. Bohr and B. Mottelson, Nuclear Structure (Benjamin, New York, 1975), Vol. 2.
4. V. V. Pashkevich and S. Frauendorf, Sov. J. Nucl. Phys. 20, 588 (1975).
5. I. N. Mikhailov, K. Neergard, V. V. Pashkevich, and S. Frauendorf, Sov. J. Part. Nucl. 8, 550 (1977).