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3. K. S. Basniev, N. M. Dmitriev, R. D. Kanevskaya, and V. M. Maksimov, Underground Hydromechanics (Inst. Komp’yut. Issled., Moscow, 2006) [in Russian].
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5. O. M. Alifanov, E. A. Artyukhin, and S. V. Rumyantsev, Extreme Methods for Solving Ill-Posed Problems (Nauka, Moscow, 1988) [in Russian].