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    • Integrability of Liénard systems with a weak saddle 

      Gasull i Embid, Armengol; Giné, Jaume (Springer International Publishing, 2017)
      We characterize the local analytic integrability of weak saddles for complex Lienard systems, x˙ = y−F(x), y˙ = ax, 0 = a ∈ C, with F analytic at 0 and F(0) = F (0) = 0. We prove that they are locally integrable at the ...