1. A. A. Il'yushin and B. E. Pobedrya, Foundations of the Mathematical Theory of Thermovis-coelasticity [in Russian], Nauka, Moscow (1970).
2. A. R. Rzhanitsyn, Theory of Creep [in Russian], Stroiizdat, Moscow (1968).
3. A. N. Filatov, Methods of Averaging Differential and Integrodifferential Equations [in Russian], Fan, Tashkent (1971).