1. Airplane trailing vortices;Spalart;Annu. Rev. Fluid Mech.,1998
2. R.T. Whitcomb, A design approach and selected wind tunnel results at high subsonic speeds for wing-tip mounted winglets, techreport NASA-TN-D-8260 (Jul. 1976). https://ntrs.nasa.gov/search.jsp?R=19760019075.
3. Rotor blade-vortex interaction noise;Yu;Prog. Aerosp. Sci.,2000
4. A review of helicopter rotor blade tip shapes;Brocklehurst;Prog. Aerosp. Sci.,2013
5. J. Tangler, The design and testing of a tip to reduce blade slap, in: 31st annual forum of the American Helicopter Society, Washington, DC, 1975.