Salam K Al-Dawery and  Mustafa S Nasser,  Conditioning Process of Fresh Activated Sludge .   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2013, vol. 84(12). 820 - 824
    [viewed 09 May 2024]. Available from: https://publications.waset.org/pdf/9996626.