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Changju Lee and  Seungmo Ku and  Sondo Kim and  Woojin Chang,  Detecting Financial Bubbles Using Gap between Common Stocks and Preferred Stocks.   journal   = {International Journal of Social, Behavioral, Educational, Economic, Business and Industrial Engineering}, [online]. World Academy of Science, Engineering and Technology. February 2017, vol. 122(2). 301 - 307[viewed 28 May 2018]. Available from: http://waset.org/publications/10006194.