2018-06-122018-06-122008LLIBRE, Jaume; MEDRADO, João C. R.; SILVA, Paulo R. da. Limit cycles for singular perturbation problems via inverse integrating factor. Boletim da Sociedade Paranaense de Matemática, Maringá, v. 26, p. 41-52, 2008.0037-8712e- 2175-1188http://repositorio.bc.ufg.br/handle/ri/15221In this paper singularly perturbed vector fields X ε defined in R 2 are discussed. The main results use the solutions of the linear partial differential equa- tion X ε V = div(X ε )V to give conditions for the existence of limit cycles converging to a singular orbit with respect to the Hausdorff distance.engAcesso AbertoLimit cyclesVector fieldsSingular perturbationInverse integrating factorArtigo