Altayeb Qasem and  Tarek Zayed and  Zhi Chen,  A Condition Rating System for Wastewater Treatment Plants Infrastructures.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2009, vol. 28(4). 104 - 108
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/15241.