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Jung–Min Yang,  Conditions for Model Matching of Switched Asynchronous Sequential Machines with Output Feedback.   journal   = {International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology. January 2017, vol. 121(1). 55 - 59[viewed 26 May 2018]. Available from: http://waset.org/publications/10006124.