1. Yu. I. Ostroushko and T. V. Degtyareva, Hydromineral Raw Materials — an Inexhaustible Source of Lithium: An Analytic Review (TsNIIatominform, Moscow, 1999) [in Russian].
2. N. P. Kotsupalo and A. D. Ryabtsev, Chemistry and Technology of Obtaining Lithium Compounds from Lithium-Bearing Hydromineral Raw Materials (Geo, Novosibirsk, 2008) [in Russian].
3. A. B. Alkhasov, “Prospects for harnessing the geothermal resources in the North Caucasus,” Persp. Energ. 7, 367–375 (2003).
4. A. B. Alkhasov, Geothermal Energy: Problems, Resources, and Technologies (Fizmatlit, Moscow, 2008) [in Russian].
5. A. B. Alkhasov and D. A. Alkhasova, “Up-to-date state and prospects for the development of geothermal resources of the North Caucasus region,” Therm. Eng. 61(6), 411 (2014), DOI: 10.1134/S0040363614030023.