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    On the Chebyshev Property of Certain Abelian Integrals Near a Polycycle

    Dumortier and Roussarie formulated in (Discrete Contin Dyn Syst 2:723–781, 2009) a conjecture concerning the Chebyshev property of a collection ...

    D. Marín, J. Villadelprat in Qualitative Theory of Dynamical Systems (2018)