Juraev M.M, Botirov S.Kh, and Khushvaqtov S.Y. “SEPARATION OF Cu (II) AND Ni (II) IONS FROM TECHNOLOGICAL SOLUTIONS USING POLYVINYL CHLORIDEBASED ION EXCHANGER”. European Journal of Agricultural and Rural Education, vol. 3, no. 7, July 2022, pp. 8-10, https://scholarzest.com/index.php/ejare/article/view/2450.