1. For recent experimental reviews seeI. Otterlund:Acta Phys. Pol. B,8, 119 (1977);W. Busza:Acta Phys. Pol. B,8, 333 (1977);H. Lubatti: inProceedings of the Workshop on Partons in Soft-Hadronic Processes, Erice 1981, edited byR. T. Van de Walle.
2. G. Ingrosso andP. Rotelli:Nuovo Cimento A,41, 233 (1977).
3. J. E. Elias, W. Busza, C. Halliwell, D. Luckey, P. Swartz, L. Votta andC. Young:Phys. Rev. D,22, 13 (1980).
4. S. A. Azimov, G. M. Chernov, K. G. Gulamov, V. Sh. Navotny andV. I. Petrov:Nucl. Phys. B,178, 457 (1981).
5. W. Czyz: inProceedings of 1978 CERN School of Physics (CERN 78-10);A. Bialas: talk presented at theFirst Workshop on Ultra-Relativistic Nuclear Collisions, Berkeley, 1978, Fermilab preprint FERMILAB-Conf-79/35-THY (1979);