Bingqian, Chen, and Lu Yijie. “Monitoring of Residual Subsidence in Old Goafs Based on Ultrashort-Baseline InSAR Technology”. Journal of Mines, Metals and Fuels 64, no. 12 (October 19, 2022): 676–683. Accessed May 9, 2024. http://informaticsjournals.com/index.php/jmmf/article/view/31634.