WASET
    H. A. Gasim and  S. R. M. Kutty and  M. Hasnain Isa,  Anaerobic Treatment of Petroleum Refinery Wastewater.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2012, vol. 68(8). 512 - 515
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/7875.