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    • About the generalized hopf bifurcations at infinity for planar cubic systems 

      Sáez, Eduardo; Vásquez, Renata; Billeke, Jorge
      In this paper we prove the existence of four infinitesimal limit cycles bifurcating at infinity for a class of planar cubic systems. Necessary and sufficient conditions to obtain a center for that class are established.
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Matemáticas.