1. PrandtlL.BetzA., Vier Abhandlungen zur Hydrodynamik und Aerodynamik, Kaiser Wilhem Inst. for Flow Research, Göttingen, Germany, 1927, p. 31.
2. MunkM. “The Minimum Induced Drag of Airfoils,” NACA TR-121, 1921.
3. JonesR. T. “The Spanwise Distribution of Lift for Minimum Induced Drag of Wings Having a Given Lift and a Given Bending Moment,” NASA TN 2249, Dec. 1950.
4. Approximate solution of minimum induced drag of wings with given structural weight