1. Shpirt, M.Ya., Kler, V.R., and Pertsikov, I.Z., Neorganicheskie komponenty tverdykh topliv (Inorganic Constituents of Solid Fuels), Moscow: Khimiya, 1990.
2. Lebedeva, L.N., Golovin, G.S., and Samuilov, E.V., Proc. Tenth Int. Conf. on Coal Sci., Taiyuan, China, 1999, vol. 1, p. 607.
3. Diaz-Somoano, M. and Martinez-Tarazona, M.R., Fuel, 2003, vol. 82, p. 137.
4. Gerasimov, G.Ya., Zhegul’skaya, N.A., Rozhdestvenskii, I.B., et al., Mat. Model., 1998, vol. 10, no. 8.
5. Vdovchenko, V.S., Martynova, M.I., Novitskii, M.V., et al., Energeticheskoe toplivo SSSR: spravochnik (USSR Energetic Fuel: Handbook), Moscow: Energoizdat, 1991.