1. Bjørnholm, S., Borggreen, J., Westgaard, L. and Karnaukov, V.A., Nucl. Phys. A95, 513 (1967).
2. Blatt, J.M. and Weisskopf, V.F., Theoretical Nuclear Physics (John Wiley & Sons, New York, 1952) p. 389.
3. Bohr, A. and Mottelson, B.R., in Beta and Gammy Spectroscopy, Edited by K. Sieagbahn (North Holland Publishing House, Amsterdam, 1955) p. 448.
4. Bohr, N. and Wheeler, J.A., Phys. Rev. 56, 426 (1939).
5. Britt, H.C., Burnett, S.C., Erkkila, B.H., Lynn, J.E. and Stein, W.E., Phys. Rev. C4, 1444 (1971).