1. Abergel, F. and Raugel, G., Cours de 3e cycle de l'Université de Paris Sud (Orsay), 1991, in preparation.
2. Arrieta, J. Carvalho, A., and Haie, J. K.,A damped hyperbolic equation with critical exponent, Preprint #29 (1990), Center for Dynamical Systems and Nonlinear Studies, Georgia Institute of Technology, Atlanta, USA. Comm. PDE, to appear.
3. Lect. Notes in Math.;B. Aulbach,1983
4. Babin, A. V. and Vishik, M. I.,Regular attractors of semigroups of evolutionary equations, J. Math. Pures Appl.62, 441?491 (1983).
5. Babin, A. V. and Vishik, M. I.,Attractors of Evolutionary Equations (in Russian), Nauka, Moscow, 1989.