Wilopo, W., D. P. E. Putra, and R. Susatio. “Aquifer Distribution and Groundwater Geochemistry in Bojonegoro Sub-District, Bojonegoro District, East Java Province, Indonesia”. Journal of Degraded and Mining Lands Management, vol. 7, no. 4, July 2020, pp. 2327-35, doi:10.15243/jdmlm.2020.074.2327.