1. Cf.e.g. J. D. Bjorken: inProceedings of the VI International Symposium on Electron and Photon Interactions at High Energies, Bonn, 1973 (Amsterdam, 1974);C. H. Llewellyn-Smith:Erice Lectures, 1974, to be published;
2. J. Ellis: invited talk held at theXVII International Conference on High-Energy Physics (London, 1974), Rutherford Laboratory (1974).
3. B. Richter:Proceedings of the XVII International Conference on High-Energy Physics (London, 1974), Rutherford Laboratory (1974).
4. J. D. Bjorken andS. Brodsky:Phys. Rev. D,1, 1416 (1970).
5. I. Andrić, I. Dadić andH. Satz: Bielefeld preprint Bi-74/20,Nucl. Phys. (in press).