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    • Nilpotent centres via inverse integrating factors 

      Algaba, Antonio; García, Cristóbal; Giné, Jaume (Cambridge University Press, 2016-10)
      In this paper we are interested in the nilpotent center problem of planar analytic monodromic vector fields. It is known that the formal integrability is not enough to characterize such centers. More general objects are ...