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4. S. V. Kuznetsov, "Influence of tangential stress at the ore—rock contact surface on the stress state of the rock," Fiz.-Tekh. Poluprov. Razrab. Polezn. Iskop., No. 4 (1970).
5. N. I. Muskhelishvili, Some Basic Problems of the Mathematical Theory of Elasticity [in Russian], Izd. AN SSSR, Moscow (1954).