1. K. G. Wilson:Phys. Rev.,179, 1499 (1969); see alsoR. Brandt:Ann. of Phys.,44, 221 (1967);W. Zimmermann:Commun. Math. Phys.,6, 161 (1967).
2. Generalized Wilson’s expansions have been studied byW. Zimmermann: to be published;R. Brandt andG. Preparata: CERN preprint TH. 1208 (1970).
3. R. Brandt andG. Preparata: CERN preprint TH. 1208 (1970).
4. B. L. Joffe:Žurn. Ėksp. Teor. Fiz., Pisma v. Redak.,9, 163 (1969).
5. H. Leutwyler andJ. Stern:Nucl. Phys.,20 B, 77 (1970).