Chao. Huo and  Roger. Barènes and  Jérémie. Gressier and  Gilles.Grondin,  Numerical Study on Parametrical Design of Long Shrouded Contra-Rotating Propulsion System in Hovering.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    November 2011, vol. 59(11). 1760 - 1769
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/6695.