1. Faculty of Agriculture, University of Niš, Kosančićeva 4, 37000 Kruševac, Serbia
2. Faculty of Technology, University of Niš, Bulevar oslobodjenja 124, 16000 Leskovac, Serbia
3. Faculty of Agronomy in Čačak, University of Kragujevac, Cara Dušana 34, 32000 Čačak, Serbia