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2. B. L. Krivoshein and V. N. Novakovskii, Izv. Akad. Nauk SSSR, Énerget. Transport, No. 6 (1973).
3. I. E. Khodanovich, B. L. Krivoshein, and R. N. Bikchentai, Thermal Processes of Trunk Gas Lines [in Russian], Nedra, Moscow (1971).
4. A. F. Chudnovskii, Thermal Physics of Soils [in Russian], Nauka, Moscow (1976).
5. Ya. S. Uflyand, Bipolar Coordinates and the Theory of Elasticity [in Russian], GITTL, Moscow (1950).