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		Stoyan SLAVOV
								Department of Mechanical Engineering and Machine Tools, Technical University of Varna		
Bulgaria	
Department of Mechanical Engineering and Machine Tools, Technical University of Varna
		Lyubomir Si Bao VAN
								Department of Mechanical Engineering and Machine Tools, Technical University of Varna		
Bulgaria	
Department of Mechanical Engineering and Machine Tools, Technical University of Varna
		Boris NIKOLOV
								Department of Communication Engineering and Technologies, Technical University of Varna		
Bulgaria	
Department of Communication Engineering and Technologies, Technical University of Varna
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