Thu, V. T., Hanh, V. T. M. and Uan, D. K. (2014) “A study on the effect of sludge concentrations on the efficiency of wastewater treatment by SBR technology”, Petrovietnam Journal, 80, pp. 59-63. Available at: https://pvj.vn/index.php/TCDK/article/view/590 (Accessed: 30April2026).