@article{CRMATH_2005__340_3_195_0,
     author = {De Maesschalck, Peter},
     title = {Gevrey properties of real planar singularly perturbed systems},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {195--198},
     publisher = {Elsevier},
     volume = {340},
     number = {3},
     year = {2005},
     doi = {10.1016/j.crma.2004.12.020},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2004.12.020/}
}