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Author(s):
1. Dragoljub Mirjanić, Akademija nauka i umjetnosti Republike Srpske,
Republic of Srpska, Bosnia and Herzegovina
2. Tomislav Pavlović, University of Nis, Faculty of Sciences and Mathematics, , Serbia
3. Ivana Radonjić, University of Nis, Faculty of Sciences and Mathematics, , Serbia
4. Darko Divnić, Akademija nauka i umjetnosti Republike Srpske,
Republic of Srpska, Bosnia and Herzegovina
Abstract