Wang, Yin, Li Hua, and Qui-bai Sun. “Construction of Index System for Economic Governance Capability of Mining Areas Based on Principal Component Analysis”. Journal of Mines, Metals and Fuels 66, no. 9 (October 23, 2022): 715–719. Accessed May 9, 2024. http://informaticsjournals.com/index.php/jmmf/article/view/31788.