1. Theory of Bifurcations of Dynamic System in the Plane;Andronov,1971
2. Geometrical Methods in the Theory of Ordinary Differential Equations;Arnold,1983
3. Singularités des applications différentiables;Arnold,1986
4. On zeroes of special abelian integrals in real domain;Iliashenko;Functional Anal. Appl.,1977
5. Generalized Hopf bifurcation and its dual: Generalized homoclinic bifurcation;Joyal;SIAM J. Appl. Math.,1988