Afrodita Zendelska (2015). EQUILIBRIUM STUDIES OF HEAVY METALS REMOVAL FROM AQUEOUS SOLUTIONS USING CLINOPTILOLITE. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 15th International Multidisciplinary Scientific GeoConference SGEM2015, ECOLOGY, ECONOMICS, EDUCATION AND LEGISLATION. https://doi.org/10.5593/sgem2015/b51/s20.040