1. Differential equations of motion for combined flapwise binding chordwise bending, and torsion of twisted nonuniform rotor blades;Houbolt;Technical Report 1348, NACA Report,1958
2. Nonlinear equations of motion for the elastic bending and torsion of twisted nonuniform rotor blades;Hodges;Technical Report, NASA TN D-7818,1974
3. Analysis of nonlinear multi-body systems with elastic couplings;Bauchau;Multibody System Dynamics,1999