Kholmurodova , S, et al. “STUDY OF SORPTION OF CU(II) IONS ON VERMICULITE-BASED SORBENT MODIFIED WITH DIETHANOLAMINE”. INTERNATIONAL JOURNAL OF SCIENCE-INNOVATIVE RESEARCH, vol. 1, no. 3, Oct. 2025, pp. 102-6, https://globalscholars.uz/index.php/ijsir/article/view/409.