1. R. Utiyama, Phys. Rev.,101, 1597 (1956); T. W. B. Kibble, J. Math. Phys.,2, 212 (1961).
2. K. P. Stanyukovich, The Gravitational Field and Elementary Particles [in Russian], Nauka (1965).
3. V. M. Nikolaenko, Acta Phys. Pol. B,7, 681 (1976); V. M. Nikolaenko, Dokl. Akad. Nauk SSSR,218, 1068 (1974).
4. V. M. Nikolaenko, Acta Phys. Pol. B,8, 911 (1977).
5. G. 't Hooft, Nucl. Phys. B,62, 444 (1973).