WASET
    Oluyemi O. Awolusi and  Abimbola M. Enitan and  Sheena Kumari and  Faizal Bux,  Nitrification Efficiency and Community Structure of Municipal Activated Sewage Sludge.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2015, vol. 105(9). 1098 - 1105
    [viewed 04 May 2024]. Available from: https://publications.waset.org/pdf/10002427.