Bingqian, C., and L. Yijie. “Monitoring of Residual Subsidence in Old Goafs Based on Ultrashort-Baseline InSAR Technology”. Journal of Mines, Metals and Fuels, vol. 64, no. 12, Oct. 2022, pp. 676-83, http://informaticsjournals.com/index.php/jmmf/article/view/31634.