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Author(s):
1. Mića Vukić , Faculty of Mechanical Engineering in Niš, Serbia
2. Jelena Janevski, Faculty of Mechanical Engineering in Niš, Serbia
3. Goran Vučković, Faculty of Mechanical Engineering in Niš, Serbia
4. Mirko Dobrnjac, Faculty of Mechanical Engineering,
Republic of Srpska, Bosnia and Herzegovina