., S., Heparona, J., ., S., ., M., Kusumawardhani, R. and Upomo, T.C. 2019. GRAVSYS Software Based on Scratch Programming for 2D Gravity Anomalies Source Responses and Its Implementation in Trangkil Gunungpati. KnE Social Sciences. 3, 18 (Jul. 2019), 645–655. DOI:https://doi.org/10.18502/kss.v3i18.4755.