Author(s):
1. Dragana Milosavljević, University of Nis, Faculty of Sciences and Mathematics, , Serbia
2. Tomislav Pavlović, University of Nis, Faculty of Sciences and Mathematics, , Serbia
3. Dragoljub Mirjanić, Akademija nauka i umjetnosti Republike Srpske, Republic of Srpska, Bosnia and Herzegovina
4. Darko Divnić, Akademija nauka i umjetnosti Republike Srpske, Republic of Srpska, Bosnia and Herzegovina
5. G Sazhko, Ukrainan engineering pedagogics academy, Department of Informatics and computer technologies, Univer, Ukraine
6. Danica Piršl, University of Nis, Faculty of Sciences and Mathematics, , Serbia