1. 1 Slovak University of Agriculture in Nitra, Faculty of Engineering , Institute of Agricultural Engineering, Transport and Bioenergetics , Nitra , Slovakia
2. 2 Slovak University of Agriculture in Nitra , Faculty of Engineering, Institute of Design and Engineering Technologies , Nitra , Slovakia
3. 3 University of Agriculture in Krakow, Faculty of Production and Power Engineering , Division of Mechanisation and Energy Technologies in Agriculture , Krakow , Poland
4. 4 Mendel University in Brno, Faculty of AgriSciences , Department of Technology and Automobile Transport , Brno , Czech Republic