1. Devons, S.: Proc. Int. Rutherford Jubilee Conf., Manchester, 1961. Ed.: Birks. London, Heywood, 1961, p. 611.
2. Sukhoruchkin, S.I.: Proc. 2nd Int. Conf. on Neutron Cross Section and Technology, Washington, 1968, Vol. 2, p. 923.
3. Sukhoruchkin, S.I.: Proc. Int. Conf. on Statistical Properties of Nuclei, Albany, New York, 1971, p. 215. Plenum Press, 1972.
4. Weinberg, S.: Phys. Lett. B 251 (1990) 288.
5. Frosch, R.: Nuovo Cim. 104 (1991) 913.