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    • Center problem for trigonometric Liénard systems 

      Gasull, Armengol; Giné, Jaume; Valls, Claudia (Elsevier, 2017)
      We give a complete algebraic characterization of the non-degenerated centers for planar trigonometric Liénard systems. The main tools used in our proof are the classical results of Cherkas on planar analytic Liénard systems ...