Wijatna, Agus Budi, Muhammad Kayis, Satrio Satrio, and Evarista Ristin Pujiindiyati. 2019. “Study of Seawater Intrusion in Deep Aquifers of Semarang Coast Using Natural Isotopes and Hydrochemicals”. Indonesian Journal on Geoscience 6 (1):17-28. https://doi.org/10.17014/ijog.6.1.17-28.