1. T. D. Lee: inParticle Physics and Introduction to Field Theory (Harwood Academic Publishers, New York, N.Y., 1981).
2. K. Wilson:Phys. Rev. D,10, 2445 (1974).
3. M. Creuyz: InQuarks, Gluons and Lattice (Cambridge University Press, Cambridge, 1983), p. 63;J. B. Kogut, R. B. Pearson andJ. Schigemitsu:Phys. Rev. Lett.,43, 484 (1979).
4. R. Balian, J. M. Drouffe andC. Itzykson:Phys. Rev. D,11, 2104 (1975).
5. K. E. Eriksson, N. Svartholm andB. S. Skagerstam:J. Math. Phys. (N.Y.),22, 2276 (1981).