Oanh*, T. T. K., and N. V. Lap. “HIGH ARSENIC CONCENTRATION IN GROUNDWATER RELATED TO SEDIMENTARY FACIES IN THE MEKONG RIVER DELTA, VIETNAM”. Vietnam Journal of Earth Sciences, vol. 38, no. 2, Apr. 2016, pp. 178-87, doi:10.15625/0866-7187/38/2/8600.