1. J. D. Bjorken:Phys. Rev.,179, 1547 (1969).
2. For a general review on theoretical works related to this subject seeJ. D. Bjorken:Lepton-hadron processes at high energy, in Scottish Summer School in Physics (1970).
3. D. H. I. Abarbanel, M. Goldbergener andS. Treiman:Phys. Bey. Lett.,22, 1078 (1969).
4. Present experiments arc in agreement with the scale invariance hypothesis. In particular meaningful experimental data are available for the ν W 2 amplitude, which is related to the differential cross-section for e-p scattering in the forward direction. SeeR. E. Taylor:Proceedings of the IV International Symposium on Electron and Photon Interactions at High Energies (1969);
5. W. Albrecht,F. W. Brasse,H. Dorner,W. Flauger,K. H. Frank,J. Gayler,H. Hultschig,V. Korbel,J. May andE. Ganssauge: DESY preprint 69/46 (1969);