1. [1] A. D. Sakharov Dok. Akad. Nauk. SSSR 177, 70, 1967; Phys. JETP, 12, 1040,1968.
2. [1] A. D. Sakharov,| Dok. Akad. Nauk. SSSR 177, 70, 1967; Sov. Phys. JETP, 12, 1040, 1968.
3. S.L. Adler, Rev. Mod. Phys., 54, 729, 1982, and references therein.
4. K. Akama, Progr. Theor. Phys., 60, 1900, 1978; 79, 1299, 1988; K. Akama and H. Terazawa, Prog. Theor. Phys., 79, 740, 1988; H. Terazawa, in Proceedings of the First International A. D. Sakharov Conference on Physics, L. V. Keldysh, et al., eds. Nova Science, New York, 1991; S. Naka and C. Itoi, Progr. Theor. Phys., 70, 1414, 1983.
5. [3] K. Akama, Progr. Theor. Phys., 60, 1900, 1978; 79, 1299, 1988; K. Akama and H. Terazawa, Prog. Theor. Phys., 79, 740, 1988