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[1]于江. On the critical periods of perturbed isochronous centers. J. Differential Equations 244 (2008), no. 3, 696--715, 2008,
[2]于江. Lower bounds for the number of limit cycles of trigonometric Abel equations. J. Math. Anal. Appl. 342 (2008), no. 1, 682--693., 2008,
[3]于江. Limit cycles for a class of three-dimensional polynomial differential systems. J. Dyn. Control Syst. 13 (2007), no. 4, 531--539, 2007,
[4]于江. On the upper bound of the number of limit cycles obtained by the second order averaging method. Dyn. Contin. Discrete Impuls. Syst. Ser. B Appl. Algorithms 14 (2007), no. 6, 841--873., 2007,
[5]于江. Stability and Hopf bifurcation analysis in a three-level food chain system with delay. Chaos Solitons Fractals 31 (2007), no. 3, 683--694., 2007,
[6]于江. Bifurcations of limit cycles from quadratic non-Hamiltonian systems with two centres and two unbounded heteroclinic loops. Nonlinearity 18 (2005), no. 1, 305--330., 2005,
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