Anđelković, Tatjana, Ružica Nikolić, Aleksandar Bojić, Darko Anđelković, and Goran Nikolić. 2010. “Binding of Cadmium to Soil Humic Acid As a Function of Carboxyl Group Content”. Macedonian Journal of Chemistry and Chemical Engineering 29 (2):215-24. https://doi.org/10.20450/mjcce.2010.168.