1. Cherepanov, A.A., Noble Metals in Ash and Slag Waste from Far Eastern Thermal Stations, Tikhookeanskaya geologiya, 2008, vol. 27, no. 2, pp. 16–28.
2. Vyalov, V.I., Bogomolov, A.Kh., Shishov, E.P., and Chernyshev, A.A., Coal Deposits of the Russian Far East and the Resource Potential of Valuable Metals, Georesursy, 2017, no. S, pp. 256–262.
3. Fomina, E.Yu. and Artemova, O.S., Studying the Possibility of Processing Ash and Slag Waste from Thermal Power Plants by Metallurgical Methods, GIAB, 2011, no. 8, pp. 273–277.
4. Sorokin, A.P., Savchenko, I.F., Noskova, L.P., Kuz’minykh, V.M., Konyushok, A.A., Rimkevich, V.S., and Krapiventseva, V.V., Multi-Purpose Use of Caustobioliths of Carbonic Series Based on Innovative Coal Chemistry Technologies in the Far East of Russia, J. Min. Sci., 2018, vol. 54, no. 1, pp. 147–157.
5. Huang, Z.X., Fan, M.H., and Tian, H.J., Rare Earth Elements of Fly Ash from Wyoming’s Powder River Basin Coal, J. Rare Earth., 2020, vol. 38, pp. 219–226.