[1] Ye Yanqian. Qualitative theory of the quadratic differential systems (I). Chin, Ann. Math.(to appear)
[2] Ye Yanqian, Limit cycles and bifurcation phenomena for the quardatic differentialsystem (Ⅲ)m= 0 having three anti-saddle (I). Chin Ann Math 17B. 2 (1996), 167-174.
[3] A. Zegeling, Separatrix cycles and multiple limit cycles in a class of quadratic systems. J.Diff. Eqs., 113, 2 (1994), 355-380.
[4] F. Dumortier, R. Roussarie and C. Rousseau, Hilbert's 16th problem for quadraticvector fields, J. Diff. Eqs.. 110, 1 (1994), 86-133.
[5] Ye Yanqian et al., Theory of limit cycles, Trans. Math. Monographs, Amer. Math.Soc., 66 (1986).
[6] Ye Yanqian, Qualilative Theory' of Polynomial Differential Systems, .Shanghai Science Technical Publisher, Shanghai (1995). (in Chinese)
[7] J. W. Reyn and R. E. Kooij, Infinite singular points of quadratic systems in the plane,Nonlinear Analysis. Theorey, Methods & Applications., 24, 6 (1995), 895-927. |
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