Minceva, M., Fajgar, R., Markovska, L., Meshko, V. Comparative Study of Zn2+, Cd2+, and Pb2+ Removal From Water Solution Using Natural Clinoptilolitic Zeolite and Commercial Granulated Activated Carbon. Equilibrium of Adsorption. Separation Science and Technology. 2008, 43(8), 2117-2143. ISSN 0149-6395. E-ISSN 1520-5754. Available: https://doi.org/10.1080/01496390801941174