1. See,e.g., Fifty Years of Weak Interactions Physics, edited byA. Bertin, R. A. Ricci andA. Vitale (Editrice Compositori, Bologna, 1984).
2. For a convenient summary, see, for example,Particle Data Group (G. P. Yost et al.):Phys. Lett. B,204, 107 (1988).
3. M. V. Barnhill III:Phys. Rev. D,36, 192 (1987).
4. V. V. Dixit, T. S. Santhanam andW. D. Thacker:Phys. Rev. D,43, 945 (1991).
5. G. Dattoli, M. Richetta andA. Torre:Nuovo Cimento B,104, 665 (1989).