1. L. I. Sedov, Introduction to the Mechanics of Solids [in Russian], Moscow, 1962.
2. Yu. N. Rabotnov, Creep of Structural Elements [in Russian], Moscow, 1966.
3. N. S. Danilov, P. L. Kuprienko, N. I. Malinin, Yu. N. Rabotnov, and I. A. Shubin, Izv. AN SSSR, Mekh. i mashinostr., 6, 20, 1963.
4. L. M. Kachanov, Theory of Creep [in Russian], Moscow, 1960.
5. M. Reiner, Rheology [Russian translation], Moscow, 141?146, 1965.