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2. Drag due to lift: concepts for prediction and reduction;Kroo;Annu. Rev. Fluid Mech.,2001
3. Rotor noise;Schmitz,1991
4. Rotor blade-vortex interaction noise;Yu;Prog. Aerosp. Sci.,2000
5. A review of helicopter rotor blade tip shapes;Brocklehurst;Prog. Aerosp. Sci.,2013