2018-06-142018-06-141997GARCIA, R.; SOTOMAYOR, J. Structurall stability of parabolic points and periodic asymptotic lines. Matemática Contemporânea, Rio de Janeiro, v. 12, p. 83-107, 1997.http://repositorio.bc.ufg.br/handle/ri/15247engAcesso AbertoStructurall stability of parabolic points and periodic asymptotic linesArtigo