1. V. Metag, in Proc. 4th IAEA Symp. on Phys. and Chem. of Fission, Julien 1979 (IAEA, Vienna, 1980), Vol. I, p. 153.
2. D.M. Brink, in Proc. Intl. School of Phys., ?Enrico Fermi?, Course XXXVI, Varenna, edited by C. Bloch (Academic, New York, 1966) p. 247.
3. D.M. Brink and E. Boeker, Nucl. Phys.A91, 1 (1967).
4. W. Bauhoff, H. Schultheis und R. Schultheis, Phys. Rev.C22, 861 (1980).
5. W. Bauhoff, H. Schultheis und R. Schultheis, Phys. Lett.B94, 285 (1980).