1. Nonlinear Oscillations;Minorsky,1962
2. Nonlinear Vibrations;Stoker,1950
3. Vibrations Non-Lineaires et Theorie de la Stabilite;Roseau,1966
4. Dispersion relation and wave solution for anharmonic lattices and Korteweg-de Vries continua;Askar,1974
5. The generalized Duffing equation with large damping;Ludeke;Int. J. Non-Linear Mech.,1968