1. A. I. Gavrishin, Usp. Sovrem. Estestvozn. 10, 102 (2016).
2. A. I. Gavrishin, Fundament. Issled. 11, 2465 (2014)
3. E. G. Gorlov, O. G. Safiev, and A. I. Seregin, Solid Fuel Chem. 42 (1), 46 (2008).
4. E. I. Zakharov, N. M. Kachurin, and I. I. Mokhnachuk, Izv. Tul’sk. Gos. Univ., Ser. Nauki Zemle 2, 58 (2012).
5. A. P. Krasavin, Environmental Protection in the Coal Mining Industry (Nedra, Moscow, 1991) [in Russian].