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3. A. F. Revuzhenko, Fiz.-Tekh. Probl. Razrabotki Polezn. Iskop., No. 2 (1974).
4. V. N. Nikolaevskii, The Mechanical Properties of Soils and the Theory of Plasticity: Mechanics of Solid Deformed Bodies, Progress in Science and Technology [in Russian], Moscow (1972), p. 6.
5. A. F. Revuzhenko and E. I. Shemyakin, Zh. Prikl. Mekhan. i. Tekh. Fiz. No. 1 (1974).