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Author(s):
1. Saša Pavlović, Faculty of Mechanical Engineering in Niš, Serbia
2. Velimir Stefanovic, Faculty of Mechanical Engineering in Niš, Serbia
3. Bellos Evangelos, National Technical University of Athens, Zografou, Heroon Polytechniou , Greece
4. Christos Tzivanidis, National Technical University of Athens, Zografou, Heroon Polytechniou , Greece
Paper for reviews