Lai, Hung-Lin, and Ting-Yu Chen. “Client Acceptance Method for Audit Firms Based on Interval-Valued Fuzzy Numbers”. Technological and Economic Development of Economy 21, no. 1 (January 29, 2015): 1-27. Accessed December 2, 2021. https://journals.vgtu.lt/index.php/TEDE/article/view/1040.