Author(s):
1. Zoran Petrović, Univerzitet u Istočnom Sarajevu.Tehnološki fakultet Zvornik, Republic of Srpska, Bosnia and Herzegovina
2. Ana Đokić, Serbia
3. Pero Dugić, Faculty of Technology Banja Luka, Republic of Srpska, Bosnia and Herzegovina
4. Tatjana Botić, Faculty of Technology Banja Luka, Republic of Srpska, Bosnia and Herzegovina
5. Dragana Kešelj, Republic of Srpska, Bosnia and Herzegovina
6. Nebojša Vasiljević, Univerzitet u Istočnom Sarajevu Tehnološki fakultet Zvornik, Republic of Srpska, Bosnia and Herzegovina
7. Marija Jevtić, Zeochem doo Zvornik, Republic of Srpska, Bosnia and Herzegovina

Abstract