Improving a method for the study of limit cycles of the Lienard equation

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In recent papers we have introduced a method for the study of limit cycles of the Lienard system: dotx=y-F(x), doty=-x, where F(x) is an odd polynomial. The method gives a sequence of polynomials Rₙ(x), whose roots are related to the number and location of the limit cycles, and a sequence of algebraic approximations to the bifurcation set of the system. In this paper, we present a variant of the method that gives very important qualitative and quantitative improvements.