1. K. G. Wilson: preprint (1960), to be published.
2. The same results have been found independently byTer-Martirosian:Žurn. Ėksp. Teor. Fiz.,39, 827 (1960)
3. S. Mandelstam:Phys. Rev.,112, 1344 (1958);115, 1741, 1752 (1959), in the following quoted as M1, M2 and M3
4. For a preliminary report seeG. F. Chew andS. C. Frautschi:Phys. Rev. Lett.,5, 580 (1960).
5. K. Symanzik:Repart, Rochester Conference 1960 and private communications. The same equations have been obtained independently byT. T. Wu on the basis of perturbation theory (private communication).