Reference:
Burtsev, A., He, W., Hayostek, S., Zhang, K., Theofilis, V., Taira, K., and Amitay, M., "Linear Modal Instabilities around Post-Stall Swept Finite Aspect Ratio Wings at Low Reynolds Numbers."
Jornal of Fluid Mech. (2022), vol. 944, A6, doi:10.1017/jfm.2022.420