Li				Zou; Liqin Zhao; Jiaxin Wang; The Exact				Bound of the Number of Limit Cycles Bifurcating from the Global				Nilpotent Center with a Nonlinear Switching Curve, International				Journal of Bifurcation and Chaos, 2022, 32(02). 				Li				Zou; Liqin Zhao; The Cyclicity of a Class				of Global Nilpotent Center Under Perturbations of Piecewise				Smooth Polynomials with Four $$\hbox {Zones}^*$$, Qualitative				Theory of Dynamical Systems, 2022, 21(3). 				Li				Zou; Liqin Zhao; Second order Melnikov				functions for planar piecewise smooth integrable non-Hamiltonian				systems with multiple zones and application, Journal of Applied				Analysis and Computation, 2023, 13(5). 			 		 |