1. http://www.se-technology.com .
2. C. Wieselsberger, Wing resistance near the ground, NACA TM No. 77, (1922).
3. M. P. Fink and J. L. Lastinger, Aerodynamic characteristics of low-aspect-ratio wings in close proximity to the ground, NASA TN D-926 (1961).
4. A. W. Carter, Effect of ground proximity on the aerodynamic characteristics of aspect-ratio-1 airfoils with and without end plate, NASA TN D-970 (1961).
5. M. R. Ahmed, T. Takasaki and Y. Kohama, Aerodynamics of a NACA4412 airfoil in ground effect, AIAA Journal, 45(1) (2007) 37–47.