Finite cyclicity of graphics with a nilpotent singularity of saddle or elliptic type - Huaiping Zhu

Finite cyclicity of graphics with a nilpotent singularity of saddle or elliptic type

Zhu, H., and Rousseau, C., 2002: Finite cyclicity of graphics with a nilpotent singularity of saddle or elliptic type. J. Differential Equations, Vol. 178 (2), p. 325–436.