“SORPTION OF Co2+, Cu2+, Zn2+ and Mn2+ METAL IONS FROM AQUEOUS SOLUTIONS ON ANIONIC SURFACTANT-MODIFIED BENTONITE”, Proc. YSU B: Chem. Biol. Sci., vol. 53, no. 2 (249), pp. 81–85, Jul. 2019, doi: 10.46991/PYSUB.2019.53.2.081.