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Affiliations: Milutin Obradović, Department of Mathematics, Faculty of Civil Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, 11000, Belgrade, Serbia, e-mail: obrad@grf.bg.ac.rs; Nikola Tuneski, Department of Mathematics and Informatics, Faculty of Mechanical Engineering, Ss. Cyril and Methodius University in Skopje, Karpoš II b.b., 1000 Skopje, Republic of North Macedonia, e-mail: nikola.tuneski@mf.edu.mk; Paweł Zaprawa, Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36, 20-618 Lublin, Poland, e-mail: p.zaprawa@pollub.pl
