1. C.S. Porter and R.G. Thomas, Phys. Rev. 104(1956)483.
2. L.M. Bollinger in Proc. Int. Conf. on Photonuclear Reactions and Applications, Ed. B.L. Berman, Lawrence Livermore Labora-tory Report CONF. No. 730301 (1973) p.783.
3. J.E. Lynn, The Theory of Neutron Resonance Reactions, Clarendon Press, Oxford 1968.
4. A.G. Bohr and B.R. Mottelson, Nuclear Structure, Vol. I, W.A. Benjamin Inc., New York, Amsterdam (1969) p. 382.
5. P.M. Endt and C. Van Der Leun, Nucl. Phys. A235 (1974)27.