Maazuza Z. Othman and  Liqiang Ding and  Yi Jiao,  Effect of Anionic and Non-ionic Surfactants on Activated Sludge Oxygen Uptake Rate and Nitrification.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2009, vol. 34(10). 601 - 607
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/11133.