Excellence in Research and Innovation for Humanity
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). 296 - 302[viewed 17 December 2017]. Available from: http://waset.org/publications/10006194.