1. T. Theodorsen, I.E. Garrick, Mechanisms of flutter, a theoretical and experimental investigation of the flutter problem, NACA Report 1940-685, 1940.
2. T. Theodorsen, I.E. Garrick, Flutter calculations in three degrees of freedom, NACA Report 1942-741, 1942.
3. A.I. Van de Vooren, J.H. Greidanus, Diagrams of critical flutter speed for wings of a certain standard type, NLR Report V. 1297, 1946.
4. D.S. Woolston, V. Huckel, A calculation study of wing-aileron flutter in two degrees of freedom for two-dimenional supersonic flow, NACA Report 846, 1946.
5. Analysis of limit cycle flutter of an airfoil in incompressible flow;Yang;Journal of Sound and Vibration,1988