1. A. A. Abrikosov, L. P. Gorkov, and I. E. Dzyaloshinski, Methods of Quantum Field Theory in Statistical Physics, Englewood Cliffs (1963).
2. N. H. March, W. H. Young, and S. Sampanthar, The Many-Body Problem in Quantum Mechanics, Cambridge University Press, Cambridge (1967).
3. L. P. Kadanoff and G. Baym, Quantum Statistical Mechanics, Benjamin, New York (1963).
4. K. A. Brueckner and K. Sawada, Phys. Rev.,106, 1117 (1957).
5. G. V. Dubrovskii and A. V. Bogdanov, Zh. Eksp. Teor. Fiz.,64, 1581 (1973).