Zuo, Ning, and Fang-Ying Ji. “Optimizing and Controlling of Dissolved Oxygen in Advanced HA-A A-MCO Sludge Reduction Process”. Asian Journal of Chemistry, vol. 24, no. 10, May 2012, pp. 4784-6, https://asianpubs.org/index.php/ajchem/article/view/9613.