“Heavy Metal Ions Cu (II), Co (II) and Cr (III) Bifunctionally Improved with Hydroxamic and Amidoxime Groups Chelating Ion Exchangers”, Ann_UGAL_MMS, vol. 32, no. 1, pp. 15–22, May 2009, Accessed: Nov. 02, 2026. Available: https://ojs.ugal.ro/index.php/mms/article/view/3061