1. Yu. N. Rabotnov, Creep of Structural Elements [in Russian], Moscow (1966).
2. A. R. Rzhanitsyn, Theory of Creep [in Russian], Moscow (1968).
3. M. A. Koltunov, Mekhan. Polim., No. 4, 483 (1966).
4. M. I. Rozovskii, in: Advances in Science, Elasticity and Plasticity [in Russian], Moscow (1967).
5. Yu. S. Urzhumtsev and R. D. Maksimov, Mekhan. Polim., No. 3, 420 (1970).