Author(s):
1. Ljiljana Topalić-Trivunović, Faculty of Technology Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Aleksandar Savić, Faculty of Technology Banja Luka, Republic of Srpska, Bosnia and Herzegovina
3. Branka Rodić-Grabovac, Faculty of Technology Banja Luka, Republic of Srpska, Bosnia and Herzegovina
4. Ranka Trivunović, Krajina Klas d.o.o. Banja Luka, Republic of Srpska, Bosnia and Herzegovina

Abstract Final paper Paper for reviews