Thanh Giao, Nguyen. “Spatial Variations of Surface Water Quality in Hau Giang Province, Vietnam Using Multivariate Statistical Techniques: DOI: 10.32526/ennrj.18.4.2020.38”. Environment and Natural Resources Journal 18, no. 4 (September 10, 2020): 400–410. accessed December 8, 2025. https://ph02.tci-thaijo.org/index.php/ennrj/article/view/240801.