1. K. Symanzik, lecgures presented at this school.
2. K. Wilson, Phys. Rev. D3, 1818 (1971)
3. G. Mack, in: Lecture Notes in Physics, vol.17, W. Riihl and A. Vancura (eds.) Springer Verlag, Heidelberg 1973. A.M. Polyakov, JETP Letters 12, 381 (1970); 32, 296 (1971). A.A. Migdal, Phys. Letters 37B, 98, 386 (1971). G. Parisi and L. Peliti, Lettere Nuovo Cimento 2, 867 (1971).
4. K. Symanzik, ili: Lectures on High Energy Physics, Jaksic (ed) Zagreb 1961, Gordon and Breach, New York 1965.
5. S. Ferrara, R. Gatto and A.F. Grillo, Lettere Nuovo Cimento 2 1363 (1971). A12, 952 (1972); Nucl. Phys. B34, 349 (1971). S. Ferrara, R. Gatto, A.F. Grillo and G. Parisi, Nucl. Phys. B49, 77 (1972); Lettere Nuovo Cimento 115 (1972).