Affiliation: | 1. Department of Electronics, Technical University–Varna, 9010, Varna, Bulgaria 2. Department of Electrical & Computer Engineering, University of Patras, Rion-Patras, 26500, Greece 3. Dept. of ECE, University of Patras, 26500, Patras, Greece 4. Dept. of Mechanical Engineering, Technological Educational Institute of Patras, 26334, Patras, Greece
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