Wang, Xiaoxia, Shuguang Lu, Zhaofu Qiu, and Weichi Ying. 2014. “Effectiveness of Waste Activated Sludge Solubilization Treated by Sonication, Thermal and Acid-Alkali Adjustment”. Asian Journal of Chemistry 26 (16):5186-94. https://doi.org/10.14233/ajchem.2014.16688.