-
[1]
W. A. Bareen et al., Phys. Rev, D11(1975), 1094.[2] T. D. Lee, Phys. Rev., 95 (1954).1329.[3] J. Rafelski. Phys. Rev., D14 (1976), 2358.[4] V. F. Weisskopf et al., Phys. Rev., D9 (1974), 3471.[5] M. Creutz, Phys, Rev., D10 (1974). 2599.[6] K. E. Cahill, R. I. Glauber, Phys. Rev., 177 (1969), 1857.[7] S. S. Schweber, "An introduction to Relativistic quantum field theory", New York, HarPer and Row, Inc. 1961.[8] S. Weinberg, Phys. Rev., 102 (1356), 258.