“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”. Indonesian Journal of Science and Technology, vol. 10, no. 1, July 2025, pp. 159-70, https://ejournal.kjpupi.id/index.php/ijost/article/view/412.