WENKERT, R., MOISA, S., TOFAN, L. and PADURARU, C. 2009. Heavy Metal Ions Cu (II), Co (II) and Cr (III) Bifunctionally Improved with Hydroxamic and Amidoxime Groups Chelating Ion Exchangers. The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science. 32, 1 (May 2009), 15-22.