Dept. of Mathematics, Southwest Missouri State University
Discrete and Continuous Dynamical Systems vol:27 issue:3 pages:963-980
The paper deals with the cyclicity of unbounded semi-hyperbolic 2-saddle cycles in polynomial Lienard systems of type (m, n) with m < 2n+1, m and n odd. We generalize the results in  (case m = 1), providing a substantially simpler and more transparant proof than the one used in .