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3. S. A. Batugin and R. K. Nirenburg, “Approximate Relation between the Elastic Constants of Anisotropic Rocks and the Anisotropy Parameters,” Fiz.-Tekh. Probl. Raz. Pol. Isk., No. 1, 7–11 (1972)
4. S. A. Batugin and R. K. Nirenburg, [J. Mining Sci. (Engl. Transl.) 8(1), 5–9 (1972)].
5. S. G. Lekhnitskii and V. V. Soldatov, “Effect of the Position of an Elliptical Hole on Stress Concentration in a Tensioned Orthotropic Plate,” Izv. AN SSSR, Mekh. Mashinostr., No. 1, 3–8 (1961).