WASET
    Ali Zaker and  Zhi Chen,  Catalytic Pyrolysis of Sewage Sludge for Upgrading Bio-Oil Quality Using Sludge-Based Activated Char as an Alternative to HZSM5.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2021, vol. 176(8). 194 - 204
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10012162.