1. University of Novi Sad, Faculty of Sciences, Department of Physics, 21000 Novi Sad, Vojvodina, Serbia
2. University of Novi Sad, Faculty of Medicine, Department of Pharmacy, 21000 Novi Sad, Vojvodina, Serbia
3. University of Banja Luka, Faculty of Sciences - Physics, 78000 Banja Luka, Republic of Srpska - B&H