1. N. N. Bogoliubov and D. V. Shirkov, Introduction to the Theory of Quantized Fields (Nauka, Moscow, 1976; Wiley, New York, 1980).
2. E. Brezin, J. C. Le Guillou, and J. Zinn-Justin, in Phase Transitions and Critical Phenomena, Ed. by C. Domb and M. S. Green (Academic, New York, 1976), Vol. VI.
3. S. Ma, Modern Theory of Critical Phenomena (Benjamin, Reading, Massachusetts, United States, 1976).
4. A. Nitzan, K. F. Freed, and M. N. Cohen, Phys. Rev. 15, 4476 (1977).
5. M. V. Sadovskii, Sov. Phys.—Usp. 24, 96 (1981)