1. Oscillations in an x4/3 potential;Mickens;Journal of Sound and Vibration,2001
2. ODE Workbench;Aguirregabiria,1994
3. Multiple-input Describing Functions and Nonlinear System Design;Gelb,1968
4. Nonlinear Oscillations;Nayfeh,1979
5. Oscillations in Planar Dynamic Systems;Mickens,1996