1. For a review see for example: H. Satz (Ed.): Statistical mechanics of quarks and hadrons. Proc. Int. Symposium, Bielefeld, 1980 Amsterdam: North Holland, 1981
2. M. Jacob, H. Satz (Eds.): Quark matter formation and heavy ion collisions. Proc Workshop, Bielefeld, 1982. Singapore: World Scientific, 1982
3. M. Jacob, J. Tran Tanh Van: Phys. Rep.88, 321 (1982)
4. R. Hagedorn, J. Rafelski: in Ref. [1a]
5. R. Hagedorn, J. Rafelski: Phys. Lett.97B, 136 (1980)