1. A recent theoretical review of the parton model is that by P.V. Landshoff and H.Osborn, CERN preprint TH 2157 ( 1976. (to be published in Electromagnetic Interactions of Hadrons, ed. A. Donnachie and G.Shaw, by Plenum Publishing Co.. This paper contains an extensive list of references.
2. M.J. Alguard et al., Phys.Rev.Lett. 37, 1261 (1976).
3. G. Hanson, Proc.7th International Colloquium on Multiparticle Reactions, Tutzing (June 1976).
4. N. Cabibbo, G. Parisi and M. Testa, Nuov.Cim.Lett. 35 (1970).
5. For a discussion of quark confinement, see K. Johnsonfs lectures at this Institute.