1. Bifurcation of 4:1 subharmonics in the non-linear Mathieu equation;Month;Mech. Res. Commun.,1982
2. Nonlinear Oscillations;Nayfeh,1979
3. Introduction to Applied Non-linear Dynamical Systems and Chaos;Wiggins,1990
4. R. Zounes, An analysis of the non-linear quasiperiodic Mathieu equation, Ph.D. Dissertation, Center for Applied Mathematics, Cornell University, Ithaca, NY, May 1997.
5. Global Bifurcations and Chaos: Analytical Methods;Wiggins,1988