1. A. H. Rosenfeld, A. Barbaro-Galtieri, J. Podolsky, L. R. Price, P. Söding, C. G. Wohl, M. Roos andW. J. Willis:Rev. Mod. Phys.,39, 1 (1967).
2. R. Hagedorn:Suppl. Nuovo Cimento,3, 147 (1965) (I);R. Hagedorn andJ. Ranft: to be published inSuppl. Nuovo Cimento, CERN preprint TH. 851 (Nov. 67) (II);R. Hagedorn: to be published inSuppl. Nuovo Cimento, CERN preprint TH. 751 (Apr. 1967) (III).
3. R. Hagedorn:Nuovo Cimento,52 A, 1336 (1967).
4. Dante Alighieri:Comedia, preprint (Foligno, 1472).
5. For detailed references to experimental data see (II).