A. Damayanti, F. Riadini, and F. D. Pamungkas, “Potential Areas of Land Subsidence in Karst Landscape: Case Study in Ponjong and Semanu District, Gunungkidul Regency, Yogyakarta, Indonesia”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 11, no. 2, pp. 712–719, Apr. 2021.