Yipeng Feng, Chanjiang Lu, Yupeng Chen, Fei Du. “An Empirical Study on the Influence of Corporate Governance on the Investment Efficiency of Listed Companies- From the Perspective of Free Cash Flow”. Design Engineering (September 29, 2020): 247 - 267. Accessed May 18, 2024. http://www.thedesignengineering.com/index.php/DE/article/view/624.