Publisher
Springer Science and Business Media LLC
Reference16 articles.
1. F. Cooper andR. Kenway:Phys. Rev. D,24, 2706 (1981). See alsoC. M. Bender, F. Cooper andL. M. Simmons jr:Phys. Rev. D,39, 2343 (1989).
2. J. Schwinger:Proc. Nat. Acad. Sci.,37, 452 (1951).
3. F. J. Dyson:Phys. Rev.,75, 1736 (1949).
4. See, for example,L. H. Ryder:Quantum Field Theory (Cambridge University Press, Cambridge, 1985), p. 192.
5. J. Bjorken andS. Drell:Relativistic Quantum Fields (McGraw-Hill, New York, N. Y., 1965), p. 388.