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2. M. Chaichian, R. Hagedorn andM. Hayashi: CERN TH. 1975.
3. We are grateful toR. Hagedorn for letting us know about these results before publication.
4. G. Rossi andB. Touschek:Meccanica statistica (Torino, 1970).
5. R. Hagedorn:Suppl. Nuovo Cimento,3, 147 (1965);Lectures given at the Academic Training Programme of CERN (1970–1971)on the Thermodynamics of Strong Interactions.