@article{CTGDC_1994__35_4_339_0,
     author = {Penon, Jacques},
     title = {Construction d'infinit\'esimaux},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {339--349},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {35},
     number = {4},
     year = {1994},
     mrnumber = {1307267},
     zbl = {0824.18003},
     language = {fr},
     url = {http://www.numdam.org/item/CTGDC_1994__35_4_339_0/}
}