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2. S. G. Lekhnitskii, Anisotropic Plates [in Russian], Izd. Gostekhizdat, Moscow (1957).
3. D. I. Sherman, ?The question of the state of stress of a ponderable half-plane with two recessed round openings?, Trudy In-ta Fiziki Zemli Akad. Nauk SSSR, No. 2, 169 (1959).