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Author(s):
1. Rada Petrovic, Faculty of Technology Banja Luka,
Republic of Srpska, Bosnia and Herzegovina
2. Jelena Penavin-Škundrić, Prirodno-matematički fakultet Banja Luka,
Republic of Srpska, Bosnia and Herzegovina
3. Branko Škundrić, Akademija nauka i umjetnosti Republike Srpske,
Republic of Srpska, Bosnia and Herzegovina
4. Nedeljko Cegar, Faculty of Technology Banja Luka,
Republic of Srpska, Bosnia and Herzegovina
Abstract