Affiliation: | 1. Faculty of Mechanical Engineering, University of Ni?, A. Medvedeva 14, 18000, Nis, Serbia 2. Mathematical Institute, Serbian Academy of Sciences and Arts, Kneza Mihaila 36, 11001, Belgrade, Serbia 3. School of Engineering, University of the West of Scotland, Paisley, PA1 2BE, UK 4. College of Engineering, Swansea University, Singleton Park, Swansea, SA2 8PP, UK
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