Serikbayev, B., D. Kamysbayev, Z. Tilepbergen, O. Ahmet, and Z. Uteuliyev. “Electrochemical Behavior of Shungite Modified With Ions of Cadmium and Nickel”. Chemical Bulletin of Kazakh National University, Vol. 65, no. 1, Mar. 2012, pp. 182-7, doi:https://doi.org/10.15328/chemb_2012_1182-187.