An Explicit Recursive Formula for Computing the Normal Form and Center Manifold of General n-Dimensional differential Systems associated with Hopf bifurcation. - Yun Tian 009; Pei Yu (Int. J. Bifurc. Chaos, 2013)

An explicit recursive formula for computing the normal forms associated with semisimple cases. - Yun Tian 009; Pei Yu (Commun. Nonlinear Sci. Numer. Simul., 2014)

Twelve limit cycles around a singular point in a planar cubic-degree polynomial system. - Pei Yu; Yun Tian 009 (Commun. Nonlinear Sci. Numer. Simul., 2014)

Seven Limit Cycles Around a Focus Point in a Simple Three-Dimensional Quadratic Vector Field. - Yun Tian 009; Pei Yu (Int. J. Bifurc. Chaos, 2014)

Center and isochronous center conditions for switching systems associated with elementary singular points. - Feng Li 043; Pei Yu; Yun Tian 009; Yirong Liu (Commun. Nonlinear Sci. Numer. Simul., 2015)