1. Hsu, P. T. "Flutter of Low Aspect Ratio Wings, Part I, Calculation of Pressure Distributions for Oscillating Wings of Arbitrary Planform in Subsonic Flow by the Kernel-Function Method," Aeroelastic and Structures Research Laboratory Technical Report 64-1,Massachusetts Institute of Technology, October 1957.
2. COLLOCATION METHOD FOR CALCULATING THE AERODYNAMIC PRESSURE DISTRIBUTIONS ON A LIFTING SURFACE OSCILLATING IN SUBSONIC COMPRESSIBLE FLOW
3. Cunningham, A. M., Jr. "On The Treatment of the Kernel Function Singularities in the Integral Equation 0: Unsteady Subsonic Lifting Surface Theory,"l3. Fort Worth Division of General Dynamics Report ERR-FW-746, 17August 1968.
4. Laschka, B. "Zur Theorie der harmonisch schwingenden tragenden Flsche bei UnterschallstrGmung.I' ZeitschriftEFlugwissenschaftenI1 (July 1963), pp.265-291.