• Natural coal fires in the Kuznetsk Coal Basin: geologic causes, climate, and age / E. V. Sokol, S. A. Novikova, D. V. Alekseev, A. V. Travin // Russian geology and geophysics. 2014. Vol. 55, № 9. P. 1043-1064. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000490154