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Jelena Ivaz
Technical Faculty of Bor, University of BelgradeSerbia
Ružica R. Nikolić
Research Center University of ŽilinaSlovakia
Dejan Petrović
Technical Faculty of Bor, University of BelgradeSerbia
Jelena M. Djoković
Technical Faculty of Bor, University of BelgradeSerbia
Branislav Hadzima
Research Center University of ŽilinaSlovakia