Geng, S., W. Zhang, Y. Zi, J. Miao, and R. Shen. “Study on the Regularity of Surface Collapse in Goaf Using UAV Remote Sensing Technology”. Journal of Mines, Metals and Fuels, vol. 70, no. 4, June 2022, pp. 182-90, doi:10.18311/jmmf/2022/30052.