Gevrey properties of real planar singularly perturbed systems

Peter De Maesschalck

Comptes Rendus. Mathématique, Volume 340 (2005) no. 3 p. 195-198

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