Vaboliene, Giedre, and Algirdas Bronislovas Matuzevičius. “Investigation into Biological Nutrient Removal from Wastewater”. Journal of Environmental Engineering and Landscape Management 13, no. 4 (December 31, 2005): 177–181. Accessed July 31, 2025. https://journals.vilniustech.lt/index.php/JEELM/article/view/8059.