Author(s):
1. Darko Divnić, Akademija nauka i umjetnosti Republike Srpske, Republic of Srpska, Bosnia and Herzegovina
2. Dragoljub Mirjanić, Akademija nauka i umjetnosti Republike Srpske, Republic of Srpska, Bosnia and Herzegovina
3. Esad Jakupović, Academy of Sciences and Arts of the Republic of Srpska, Bana Lazarevića 1, 78000 Banja Luka, Republi, Republic of Srpska, Bosnia and Herzegovina
4. Zoran Ž. Avramović, University od Belgrade, Serbia
5. Tomislav Pavlović, University of Nis, Faculty of Sciences and Mathematics, , Serbia
6. Ivana Radonjić Mitić, University of Niš, Faculty of Sciences and Mathematics, Department of Physics, Višegradska 33, Niš, Serbia

Abstract