1. Faculty of Electronic Engineering, University of Nis, 14 Aleksandra Medvedeva, 18000 Nis, Serbia
2. Institute of Technical Sciences of SASA, 35 Kneza Mihaila, 11000 Belgrade, Serbia
3. University of K. Mitrovica, Faculty of Teachers Education, Leposavic, Serbia
4. Faculty of Business Economics and Entrepreneurship, Mitropolita Petra 8, 11000 Belgrade, Serbia
5. University of Ulm, Institute of Functional Nanosystems FNS, Albert-Einstein-Allee 45, 89081 Ulm, Germany
6. North Carolina Central University, USA Durham NC, USA