Kats, E.M., Nikashina, V.A. and Bichkova, J.V. 2019. The kinetic sorption of heavy metals from surface water on natural and modified polyethilenimine clinoptilolite of Holinsky deposit. Sorbtsionnye i Khromatograficheskie Protsessy. 16, 1 (Nov. 2019), 36-43.