Institution: | a Faculty of Agriculture, Department of Agricultural Engineering, University of Novi Sad, Trg Dositeja Obradovi?a 8, 21000 Novi Sad, Serbia b Institute of Mathematics, Serbian Academy of Science and Art, Kneza Mihaila 35, 11000 Belgrade, Serbia c Faculty of Civil Engineering, University of Novi Sad, Kozara?ka 2a, 24000 Subotica, Serbia |