Asif Mansoor and  Nasiruddin Khan and  Noreen Jamil,  Quantitative Study for Exchange of Gases from Open Sewer Channel to Atmosphere.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    February 2008, vol. 14(2). 130 - 132
    [viewed 01 October 2020]. Available from: https://publications.waset.org/pdf/10523.