Sidauruk, P., Pujiindiyati, E. R., & Satrio, S. (2016). Subsurface Flow and Surface Water Interactions Quantification in Gunung Kidul Karst Area Using Hydro- Chemical and Stable Isotopes Data Variations. Jurnal Ilmiah Aplikasi Isotop Dan Radiasi, 11(1), 65–72. https://doi.org/10.17146/jair.2015.11.1.2700