-
[1]
D. A. Kirzhnits and A. D. Linde, Phys, Lett.,42B(1971), 471. D. A. Kirzhnits., JETP Lett., 15 (1972). 529. S. Weinberg, Phys. Rev., D9 (1974), 3357. L. Dolan and R. Jackiw. Phys. Rev., D9 (1974), 3320. M. B. Kislinger and P. D. Morley, Phys. Rev., D13 (1976), 2765.[2] M. B. Kislinger and P. D. Morley, Phys. Rev., D13 (1976), 2771. S. Weinberg, Phys. Rev., D9 (1974). 3357. D. Dolan and R. Jackiw, Phys. Rev., D9 (1974), 3320.[3] J. Schwinger, J. math. Phys., 2 (1961). 407. L. V. keldysh. JETP, 20 (1965), 1018. R. A. Graig. J, Math. Phys., 9(1968), 605. Mills. R., Propagators for many particle systems. New York: Gorden and Breach. 1969. V. Koremuan. Ann. Phys. (X. Y.), 39(1966), 72. V. L. Berezinskii, JETP, 26(1968), 137. G. Niklasson and A. Sjlander, Ann. Phys., (N. Y.), 49(1968).249. G. Niklasson and A. Sjlander, Ann. Phys., (N. Y.), 49 (1968). 249. C. P. Enz. The many body problem. New York, Plenum Press, 1969. R. Sandstrm. Phys. Stat. Solidi, 38 (I970), 683. C. Garuli, R. Combescot. P. Nozieres. D. Saint-James, J. Phys., C4 (1971). 916.[4] A. Hall, Moleculur Phys., 28 (1974), 1; J. Phys., A8 (1974), 214.[5] K. Symanzih, Commun. Math. Pgys., 23 (1971),49. C. G. Callan. Phys. Rev., D5 (1972), 3202.[6] G. 't Hooft, Nucl. Phys., B61 (1973), 455. J. C. Collins and A. J. Macfarlane, Phys Rev., D10 (1974), 1210. W. S. Weinberg. Phys. Rev., D8 (1973), 3497.