Abstract：
In this paper limit cycles of cubic Van der Pci equation x- (b01 +b21 x2 + b02x+b12xx)x + x(1 -b20x - b30x2) = 0 is discussed, where . The existenceof limit cycle for such an equation depends on its coefficients b01 and b21 and the convergence of the function F(x) =
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Annals of Differential Equations
ISSN： 2096-0174
CN： 35-1328/O1
Year： 1997
Issue： 02
Page： 125-139
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