1. A. D. Duchkov, S. V. Lysak, V. T. Balobaev, et al., Teplovoe pole nedr Sibiri (Thermal Field of the Earth’s Interior in Siberia) (Nauka, Novosibirsk, 1987) [in Russian].
2. H. Hamamoto, M. Yamano, and S. Goto, Geophys. Rev. Lett. 32(21), L21311 (2005).
3. H. S. Carslaw and J. C. Jaeger, Conduction of Heat in Solids, 2nd ed. (Oxford Univ., N.Y., 1986).
4. O. M. Alifanov, E. A. Artyukhin, and S. V. Rumyantsev, Extreme Methods for the Solution of Ill-Posed Problems (Nauka, Moscow, 1988) [in Russian].
5. M. M. Lavrentiev and V. I. Priimenko, in Comp. Tomogr. Proc. Intern. Symp. Novosibirsk, August 1993 (VSP, Utrecht, 1995), pp. 217–224.