1. Optical Resonance and Two-Level Atoms;Allen,1975
2. Geometrical Methods in the Theory of Ordinary Differential Equations;Arnold,1983
3. Polynomial flows in the plane;Bass;Adv. in Math.,1985
4. Polynomial flows, symmetry groups, and conditions sufficient for injectivity of maps;Coomes,1988
5. Nonlinear Oscillations, Dynamical Systems, and Bifurcations of Vector Fields;Guckenheimer,1983