1. J. D. Bjorken, Phys. Rev. 179, 1547 (1969). R. P. Feynman (unpublished)
2. Phys. Rev. Letters 23f 1415 (1969)
3. Proceedings of the Third International Conference on High Energy Collisions at Stony Brook (Gordon and Breach, New York, 1969). J. D. Bjorken and E. A. Paschos Phys. Rev. J85, 1975 (1969).
4. See also V. A. Matveev, R. M. Muradyan and A. N. Tavkhelidze, JINR E2-5962, Dubna, 1971. I wish to thank J. D, Bjorken for calling my attention to this preprint, in which the authors have also independently emphasized the impor- f-ance of dimensional analysis in high energy physics.
5. See the rapporteur’s report given by S. D. Drell, in Proceedings of the Amsterdam International Conference on Elementary Particles, 1971 (to be pub¬lished).