-
[1]
D. R. Bés et al., Phys. Lett., 52B(1974), 253.[2] D. R. Bés et al., Nucl. Phys, A260(1976), 1;22; 27;P. F. Boreienon et al.. Phys. deport. 30C(1977). 305[3] D. R.. Bés et al., Nucl. Phys., A293(1977), 350.[4] R. D. Mathuck, "A guide to Feynman Diagrams in the many-body problem ", McGlraw-Hill,London,1967.