Rousseau, C., Shan, C., and Zhu, H., 2015: Finite cyclicity of some graphics through a nilpotent point of saddle type inside quadratic systems. Qualitative Theory of Dynamical Systems, Vol. 15 (1), p. 237–256
Rousseau, C., Shan, C., and Zhu, H., 2015: Finite cyclicity of some graphics through a nilpotent point of saddle type inside quadratic systems. Qualitative Theory of Dynamical Systems, Vol. 15 (1), p. 237–256