1. D.J. Gross in: Methods in field theory. Les Houches 1975, eds. R. Balian, J. Zinn-Justin, Amsterdam: North Holland 1976; C. Itzykson, J.B. Zuber in: Quantum field theory, New York: McGraw-Hill 1980
2. G. Preparata, W.I. Weisberger: Phys. Rev.175, 1965 (1968)
3. R.J. Crewther in: Weak and electromagnetic interactions at high energies, eds. M. Levy et al.: New York: Plenum 1976; W. Konetschny, W. Kummer: Nucl. Phys.B124, 145 (1977); R. Tarrach: Nucl. Phys.B196, 45 (1982); D. Espriu, R. Tarrach: Z. Phys. C?Particles and Fields16, 77 (1983)
4. S. Ferrara, B. Zumino: Nucl. Phys.B 87, 207 (1975)
5. T. Curtright: Phys. Lett.71B, 185 (1977); T. Hagiwara, S.Y. Pi, H.S. Tsao: Ann. Phys.130, 282 (1980); H. Nicolai, P.K. Townsend: Phys. Lett.93B, 11 (1980)