1. G. Dattoli, G. Maino, C. Mari andA. Torre:Nuovo Cimento A,105, 1127 (1992);G. Dattoli, L. Giannessi andC. Mari:Nuovo Cimento A,105, 1555 (1992).
2. See,e.g.,A. Bertin,R. A. Ricci andA. Vitale (Editors).Fifty Years of Weak Interactions Physics (Editrice Compositori, Bologna, 1984).
3. H. Harary: inResults and Perspectives in Particle, Physics, edited byM. Greco (Editions Frontière, Gif-sur-Yvette, 1987).
4. L. Wolfenstein:Phys. Rev. Lett.,51, 1945 (1983).
5. F. R. Gantamakher:The Theory of Matrices (Chelsea, New York, N.Y., 1959).