1. Hodges DH Dowell EH. Nonlinear equations of motion for the elastic bending and torsion of twisted nonuniform rotor blades Technical Report 1974
2. Coupled flap-lag-torsional dynamics of hingeless rotor blades in forward flight;Friedmann;Journal of the American Helicopter Society,1982
3. Flap-lag-torsion in forward flight helicopter;Panda;Journal of the American Helicopter Society,1985
4. Nonlinear flexure and torsion of rotating beams, with application to helicopter rotor blades-II. Response and stability results;Crespo Da Silva;Vertica,1986
5. Development of nonlinear beam elements for rotorcraft comprehensive analyses;Hodges;Journal of the American Helicopter Society,2007