[1] J. Brilla:
Stability problems in mathematical theory of viscoelasticity. in Equadiff IV, Proceedings, Prague, August 22-26, 1977 (ed. J. Fabera). Springer, Berlin-Heidelberg- New York 1979.
MR 0535322
[2] N. Distéfano:
Nonlinear Processes in Engineering. Academic press, New York, London 1974.
MR 0392042
[3] A. N. Kolmogorov S. V. Fomin:
Elements of the theory of functions and functional analysis. (Russian). Izd. Nauka, Moskva 1976.
MR 0435771
[4] J. L. Lions:
Quelques méthodes de résolution des problèmes aux limites no linéaires. Dunod, Gautier-Villars, Paris 1969.
MR 0259693