Irvandi MA, Siswoyo H, Irawan DE. Chemical Characteristics of Surface Water of Sumpil River and Groundwater on its Surroundings. UJE [Internet]. 2022 Jun. 23 [cited 2024 May 3];2(1):1-8. Available from: https://e-journal.urecol.org/index.php/uje/article/view/137