1. 1Munk,M.M."TheMinimumInducedDragofAerofoils,"NACAReportNo.121,1923.
2. 2Cone, C. D. "The Theory of Induced Lift and Minimum Induced Drag of Non-planar Lifting Systems," NACA Technical ReportR-139,1962.
3. 3Whitcomb, R. T. "A Design Approach and Selected Wind Tunnel Results at High Subsonic Speeds for Wing-Tip mounted Winglet", NASA TN-D-8260,1976.
4. 4Maughmer,M.D. "TheDesign ofWinglets forHighPerformanceSailplanes",AIAA2001-2406,December2000
5. Investigation of aerodynamic improvements using wing tip sails