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K. Eryesil and  O. Esmen and  A. Beduk,  The Role of Strategic Flexibility for Achieving Sustainable Competition Advantage and Its Effect on Business Performance.   journal   = {International Journal of Social, Behavioral, Educational, Economic, Business and Industrial Engineering}, [online]. World Academy of Science, Engineering and Technology. October 2015, vol. 106(10). 3469 - 3475[viewed 21 March 2018]. Available from: http://waset.org/publications/10002643.