@article{CRMATH_2005__341_9_573_0,
     author = {Issa A. Tall and Moussa Balde},
     title = {Normal forms for nonlinear control systems with scalar output},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {573--578},
     publisher = {Elsevier},
     volume = {341},
     number = {9},
     year = {2005},
     doi = {10.1016/j.crma.2005.09.023},
     language = {en},
}