1. Gasification of the Pskov region Available at: https://gazprommap.ru/pskovskaya/ date accessed: 29.06.2020
2. S. I. Golovkov, I. F. Koperin and V. I. Naydenov, Energy use of wood waste (M.: Lesn. prom-th., 1987)
3. V. P. Galkin and I. I. Postnikov, Materials of the All-Union Scientific and Technical Conference (Arkhangelsk, 1990). Pp. 127–128.
4. Fuel supply [Electronic resource]. Available at: https://kotel-kv.kz/toplivopodacha.html|
5. R. V. Kondratyev and M. A. Kocheva, Privolzhsky scientific journal 1(49) 70–76 (2019).