A. Zendelska, M. Golomeova, Šaban Jakupi, K. Lisičkov, S. Kuvendžiev, and M. Marinkovski, “CHARACTERIZATION AND APPLICATION OF CLINOPTILOLITE FOR REMOVAL OF HEAVY METAL IONS FROM WATER RESOURCES”, GeolMac, vol. 32, no. 1, pp. 21-32, Jun. 2018.