Presence of Arsenic anomalies in groudwater and its related with geological structures: case study of Dak Nong province - Đạt, Huỳnh; Việt, Trần; Vinh, Bùi; Thủy, Hoàng; Phương, Trịnh; Loan, Từ; Long, Phan; Luật, Lê (VNUHCM Journal of Environment and Earth Sciences, 2021)