Trinh Hoai, T., Tran Thi, T.H., Le Thi , P.Q., Vu Le , P., Le Duc, A. and Mai Duc , D. 2021. Groundwater quality evaluation using Water Quality Index and GIS technique for the Holocene and Pleistocene aquifers in the coastal zone of Ninh Thuan province. Vietnam Journal of Marine Science and Technology. 21, 2 (Jun. 2021), 133–148. DOI:https://doi.org/10.15625/1859-3097/16402.