Alien limit cycles near a Hamiltonian 2-saddle cycle

Magdalena Caubergh; Freddy Dumortier; Robert Roussarie

Comptes Rendus. Mathématique, Volume 340 (2005) no. 8 p. 587-592

Time and entry–exit relation near a planar turning point

Peter De Maesschalck; Freddy Dumortier

Comptes Rendus. Mathématique, Volume 339 (2004) no. 5 p. 359-364