1. See, for example,G. Miller et al.: XV International Conference on High-Energy Physics (Kiev, 1970), and references therein.
2. K. Wilson:On short-distance behaviour in quantum field theory, Cornell Report, unpublished.
3. K. Wilson:Phys. Rev.,179, 1499 (1969).
4. C. G. Callan jr.:Phys. Rev. D,2, 1451 (1970).
5. K. Symanzik:Comm. Math. Phys.,18, 227 (1970);23, 71 (1971).