@article{CRMATH_2003__336_2_129_0,
     author = {Canalis-Durand, Mireille and Sch\"afke, Reinhard},
     title = {On the normal form of a system of differential equations with nilpotent linear part},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {129--134},
     publisher = {Elsevier},
     volume = {336},
     number = {2},
     year = {2003},
     doi = {10.1016/S1631-073X(02)00022-5},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/S1631-073X(02)00022-5/}
}