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2. Survey and comparison of engineering beam theories for helicopter rotor blades;Kunz;Journal of Aircraft,1994
3. Dynamic nonlinear elastic stability of helicopter rotor blades in hover;Friedmann,1972
4. Nonlinear equations for bending of rotating beams with application to linear flap-lag stability of hingeless rotors;Hodges,1973
5. Nonlinear equations of motion for the elastic bending and torsion of twisted nonuniform rotor blades;Hodges,1974