Chen, Liai, Hongxun Hou, and Jiaquan Wang. “Modeling and Analysis of the Wastewater Treatment Plant Operating Costs Based on Oxidation Ditch Process”. Asian Journal of Chemistry 25, no. 10 (May 3, 2013): 5801–5804. Accessed May 15, 2026. https://asianpubs.org/index.php/ajchem/article/view/25_10_148.