Setianto, Agung, et al. “Application of Landsat 8 Image in An Assessment of Hydrothermal Alteration Mapping in Dense Vegetation: A Case Study from Kokap Area, Kulon Progo”. Indonesian Journal on Geoscience, vol. 9, no. 1, Dec. 2021, pp. 45-60, doi:10.17014/ijog.9.1.45-60.