Kao, Ching Kuei, Bey Rong Kung, and Wen Ih Hsieh. “Application of Grey Relational Analysis to Determine Key Factors for Performance Measurement of Taiwan High Speed Rail Service Quality”. Asian Journal of Business and Management 5, no. 1 (February 15, 2017). Accessed September 26, 2022. https://ajouronline.com/index.php/AJBM/article/view/4460.