1. R. Temam, Infinite Dimensional Dynamical Systems in Mechanics and Physics, Springer: Berlin etc., 1989.
2. D. Ruelle, Comm.Math.Phys. 87, 287 (1982).
3. E. Lieb, Comm.Math.Phys. 92, 473 (1984).
4. U. Brosa, J. Stat. Phys., to appear 1989.
5. H. Effinger, S. Grossmann, Z. Phys. B66, 389 (1987).