“Sorption of heavy metals (Cu2+, Cd2+, Pb2+, Zn2+) on bentonite clay Zyryansk deposits Kurgan region” (2019) Sorbtsionnye i Khromatograficheskie Protsessy, 11(4). Available at: https://journals.vsu.ru/sorpchrom/article/view/1956 (Accessed: 4 April 2026).