Affiliation: | 1. Institute of Information and Communication Technologies, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 25A, 1113, Sofia, Bulgaria 2. Faculty of Mechanical Engineering, Lublin University of Technology, 20-618, Lublin, Poland 3. Institute of Mechanics, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 4, 1113, Sofia, Bulgaria
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