1. See, for instance,E. Predazzi:Riv. Nuovo Cimento,6, 217 (1976), and the literature therein.
2. For a complete review of the present situation on low-multiplicity hadronic reactions, seeV. A. Tsarev: plenary talk at theXIX International Conference on High-Energy Physics, Tokyo, August 1978
3. For an updated review on high-multiplicity hadronic processes seeR. E. Diebold: plenary talk at theXIX International Conference on High-Energy Physics, Tokyo, August 1978.
4. E. Predazzi:Nuovo Cimento,48 A, 1014 (1967).
5. U. Amaldi, R. Biancastelli, C. Bosio, G. Matthiae, J. V. Allaby, W. Bartel, G. Cocconi, A. N. Diddens, R. W. Dobinson andA. M. Wetherell:Phys. Lett.,44 B, 113 (1973);S. R. Amendolia, G. Bellettini, P. L. Braccini, C. Bradaschia, R. Castaldi, V. Cavasinni, C. Cerri, T. Del Prete, L. Foà, P. Giromini, P. Laurelli, A. Menzione, L. Ristori, C. Sanguinetti, M. Valdata, G. Finocchiaro, P. Grannis, D. Green, R. Mustard andR. Thun;Phys. Lett.,44 B, 119 (1973).