1. Faculty of Technology Novi Sad, University of Novi Sad, Bulevar cara Lazara 1, 21102 Novi Sad, Serbia
2. Faculty of Technology, University of Niš, Bulevar Oslobođenja 124, 16000 Leskovac, Serbia
3. Faculty of Technical Sciences, University of Kragujevac, Svetog Save 65, 32102 Čačak, Serbia