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2. A. A. Il'yushin and B. E. Pobedrya, Fundamentals of the Mathematical Theory of Thermoviscoelasticity [in Russian], Moscow (1970).
3. O. C. Zienkiewicz and Y. K. Cheung, Finite Element Method in Engineering Science, McGraw-Hill.
4. I. E. Troyanovskii, ?Forced oscillations of a viscoelastic system with a finite number of degrees of freedom?, Mekh. Polim., No. 5, 927?929 (1973).