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2. Electrical Prospecting. Geophysicist’s Manual, Ed. by G. Tarkhov (Nedra, Moscow, 1980) [in Russian].
3. J. Beck, B. Blackwell, and C. St.-Clair, Inverse Heat Conduction Ill-Posed Problem (Wiley, New York, 1985; Mir, Moscow, 1989).
4. A. N. Tikhonov and V. Ya. Arsenin, Solution of Ill-Posed Problems (Wiley, New York, 1977; Nauka, Moscow, 1979).
5. R. P. Fedorenko, Approximate Solution of Optimal Control Problems (Nauka, Moscow, 1978) [in Russian].