1. Non-linear equations of motion for the elastic bending and torsion of twisted non-uniform rotor blades;Hodges;NASA TN D-7818,1974
2. An experimental study of the non-linear stiffness of a rotor blade undergoing flap, lag and twist deformations;Dowell,1975
3. Aerodynamics;Mil;Helicopters: Calculation and design,1967
4. Steady flight differential equations of motion for a flexible helicopter blade with chordwise mass unbalance;Arcidiacono;USAAVLABS TR68-18A,1969
5. Dynamic non-linear elastic stability of helicopter rotor blades in hover and in forward flight;Friedmann;NASA CR-114485,1972