Kun, Zhang, Ming Ji, Guo Hongjun, and He Wenrui. “Study on Reasonable Width of Coal Pillar in Thick Coal Seam Section”. Journal of Mines, Metals and Fuels 67, no. 2 (October 20, 2022): 99–104. Accessed May 9, 2024. http://informaticsjournals.com/index.php/jmmf/article/view/31494.