USING SMOOTHNESS-CONSTRAINT LEAST-SQUARES INVERSION OF SCHLUMBERGER CONFIGURATION RESISTIVITY GEOELECTRIC METHOD TO ANALYZE GROUNDWATER DISTRIBUTION AT PADANG SELATAN. einstein e-j. [Internet]. 2025 Oct. 27 [cited 2026 Mar. 23];13(3):7-13. Available from: https://jurnal.unimed.ac.id/2012/index.php/einsten/article/view/69054