Ahmet Selim Durna and  Bayram Celik and  Aydin Misirlioglu,  Vortex Wake Formation and Its Effects on Thrust and Propulsive Efficiency of an Oscillating Airfoil.   journal   = {International Journal of Aerospace and Mechanical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2012, vol. 68(8). 1496 - 1502
    [viewed 21 October 2019]. Available from: https://publications.waset.org/pdf/6978.