Liu, Libao. “A Modelling Study on Multi-Mine and Multiproduct in Guizhou Province, China”. Journal of Mines, Metals and Fuels 66, no. 5 (October 21, 2022): 292–296. Accessed May 11, 2024. https://www.informaticsjournals.com/index.php/jmmf/article/view/31708.