B.T. Ermagambet, G.E. Remnev, S.M. Martemyanov, A.A. Bukharkin, Zh.M. Kasenova, и N.U. Nurgaliyev. «DIELECTRIC PROPERTIES OF THE COALS OF MAYKUBEN AND EKIBASTUZ BASINS». Academic Scientific Journal of Chemistry, no. 6 (апрель 24, 2022): 38–45. просмотрено декабрь 5, 2025. http://89.250.84.46/chemistry-technology/article/view/3648.