WASET
    Mamdouh Y. Saleh and  Gaber EL Enany and  Medhat H. Elzahar and  Mohamed Z. Elshikhipy and  Rana Hamouda,  Removal of Lead in High Rate Activated Sludge System.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2014, vol. 88(4). 413 - 418
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/9998020.