Optimization of Piper Trilinier Diagram Using Lithium Isotope Systematics: An Application for Detecting the Contribution of Geothermal Water from Aso Caldera after Earthquake 2016 in Kumamoto Aquifer, Japan. Indones. j. sci. technol. 2025;10(1):159-170. Accessed June 7, 2026. https://ijost.upi.edu/index.php/ijost/article/view/446