Anđelković, T., Nikolić, R., Bojić, A., Anđelković, D. and Nikolić, G. (2010) “Binding of cadmium to soil humic acid as a function of carboxyl group content”, Macedonian Journal of Chemistry and Chemical Engineering, 29(2), pp. 215–224. doi: 10.20450/mjcce.2010.168.