Wang, Hao, Xuejin Li, and Lei Zhang. “Effect of Vertical Subsurface Wetlands in Removing Chemical Nitrogen and Phosphorus from Secondary Effluent of Wastewater Treatment Plant”. Asian Journal of Chemistry 25, no. 5 (December 11, 2012): 2703–2705. Accessed July 22, 2024. https://asianpubs.org/index.php/ajchem/article/view/25_5_76.