Minh, N. T., D. D. Hung, C. S. Thang, and T. M. Duc. “Zeta Study of Water Samples on Ba and Dong Nai River Basins”. Vietnam Journal of Earth Sciences, vol. 37, no. 2, Nov. 2015, pp. 104-9, doi:10.15625/0866-7187/37/2/7364.