1. L.D. Landau: Izv. Akad. Nauk SSSR Ser. Fiz. 17 (1953) 51; Collected Papers of L.D. Landau, D. Ter Haar (ed.), p. 569. Oxford: Pergamon 1965
2. For recent developments of hydrodynamical models, see for exemple J.P. Blaizot, J.Y. Ollitrault: Hydrodynamics of quarkgluon plamas, in: Quark-gluon plasma, R.C. Hwa (ed.). Singapore: World Scientific 1990; R.B. Clare, D. Strottman: Phys. Rep. 141 (1986) 177 and the references therein
3. Y. Hama: Nuovo Cimento 46A (1978) 569
4. S. Kagiyama, A. Minaka, A. Nakamura: Prog. Theor. Pys. 81 (1989) 266
5. R. Venugopalan, M. Prakash: Phys. Rev. C 41 (1990) 221