1. N. N. Bogoliubov and V. D. Shirkov, Introduction to the Theory of Quantized Fields (Nauka, Moscow, 1976, Wiley, N.Y., 1980).
2. V. G. Kadyshevskii, M. D. Mateev, and M. V. Chizhov, Theor. Math. Phys. 45, 1077 (1980).
3. Y. Nambu and G. Jona-Lasinio, Phys. Rev. 122, 345 (1961).
4. E. Kartan, Theory of Spinors (Inostrannaya Literatura, Moscow, 1947) [in Russian].
5. B. van der Waerdan, Nachr. Ges. Wiss. Gött., 100 (1929)