Author(s):
1. Slavica Sladojević, 2. Darko Bodroža, Republic of Srpska, Bosnia and Herzegovina
3. Jelena Penavin-Škundrić, Prirodno-matematički fakultet Banja Luka, Republic of Srpska, Bosnia and Herzegovina
4. Zorica Levi, Faculty of Technology Banja Luka, Republic of Srpska, Bosnia and Herzegovina
5. Dragica Lazić, Republic of Srpska, Bosnia and Herzegovina
6. Gordana Ostojic, Republic of Srpska, Bosnia and Herzegovina

Abstract