1. Munk,M. 'MinimumInduced Dragof Airfoils', NACATR 121,1921.
2. Jones,R. 'The Spanwise Distribution of Lift for Minimum Induced Dragof Wings Having GivenLift and Root Bending Moment', NACATN-2249,1950.
3. Jones,R. and Lasinski,T.'Effect of Wingletson the Induced Drag of IdealWing Shapes', NASATM-81230,1980.