Imran Siddique,  Exact Solution of Some Helical Flows of Newtonian Fluids.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    July 2008, vol. 19(7). 420 - 423
    [viewed 17 May 2022]. Available from: https://publications.waset.org/pdf/4739.