Author(s):
1. Blanka Škipina, Republic of Srpska, Bosnia and Herzegovina
2. Z. Kukrić, Faculty of Technology Banja Luka, Republic of Srpska, Bosnia and Herzegovina
3. M. Milošević, Faculty of Technology Banja Luka, Republic of Srpska, Bosnia and Herzegovina
4. A.s Luyt, Center for Advanced Materials, Qatar University, PO Box 2713, Doha, Qatar, Qatar
5. Duško Dudić, Department of Chemistry, University of the Free State, Private Bag X13, Phuthaditjhaba, 9866 South A, Serbia