Arifin, M. R., H. Yusoff, A. Yamin, A. Abdullah, M. Zakaryia, S. Shuib, and S. Suhaimi. “Evolution of the Leading-Edge Vortex over a Flapping Wing Mechanism”. Journal of Mechanical Engineering and Sciences, vol. 14, no. 2, June 2020, pp. 6888-94, doi:10.15282/jmes.14.2.2020.27.0539.