“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” (2025) Indonesian Journal of Science and Technology, 10(1), pp. 159–170. Available at: https://ijost.upi.edu/index.php/ijost/article/view/446 (Accessed: 7 June 2026).