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V. Goga
Faculty of Electrical Engineering and Information Technology, Slovak University of Technology in Bratislava, Department of Mechanics, Ilkovičova 3, 812 19 Bratislava, Slovakia
B. Hučko
Faculty of Mechanical Engineering, Slovak University of Technology in Bratislava,Institute of Applied Mechanics and Mechatronics, Nám. Slobody 17,812 31 Bratislava, Slovakia