Ihsan, H., M. Hadi, and J. Sartohadi. “Step-Wise Overlay Technique for the Mapping of Unconfined Groundwater Potential Zone in Tectonically Controlled Landforms”. International Journal of Geoinformatics, vol. 16, no. 4, Dec. 2020, pp. 20-28, https://ijg.journals.publicknowledgeproject.org/index.php/journal/article/view/1791.