Mohamed F. Awad and  M. Kraume,  Mycoflora of Activated Sludge with MBRs in Berlin, Germany.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2011, vol. 54(6). 348 - 352
    [viewed 18 February 2020]. Available from: https://publications.waset.org/pdf/9370.