Minceva, M., Markovska, L. and Meshko, V. (2007) “Removal of Zn<sup>2+</sup>, Cd<sup>2+</sup> and Pb<sup>2+</sup> from binary aqueous solution by natural zeolite and granulated activated carbon”, Macedonian Journal of Chemistry and Chemical Engineering, 26(2), pp. 125–134. doi: 10.20450/mjcce.2007.267.