et. al., Han-Hsing Yu ,. “Research on Production Efficiency and Ownership Concentration---Taking Steel Industry and Logistics Industry As Examples”. Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 11 (May 10, 2021): 3958–3969. Accessed May 2, 2024. https://turcomat.org/index.php/turkbilmat/article/view/6519.