1. Department Zvečan, Kosovo and Metohija Academy of Applied Studies, Nušićeva St. 6, 38227 Zvečan, Serbia
2. Technical Faculty in Bor, University of Belgrade, Vojske Jugoslavije St. 12, 19210 Bor, Serbia
3. Faculty of Technical Sciences, University of Priština in Kosovska Mitrovica, Kneza Miloša St. 7, 38220 Kosovska Mitrovica, Serbia