Neamsungneon, N., and T. Sriwiriyarat. “Effects of Hydraulic Retention Time on Process Stability of Integrated Fixed Film Activated Sludge (IFAS) Biological Wastewater Treatment Process”. Burapha Science Journal, vol. 26, no. 1 January-April, Mar. 2026, pp. 474-87, https://li05.tci-thaijo.org/index.php/buuscij/article/view/1471.