@article{MZ_1978__163_172746,
     author = {Jean Perraud},
     title = {Sur les conditions de petite simplification qui permettent d'utiliser l'algorithme de {Dehn.}},
     journal = {Mathematische Zeitschrift},
     pages = {133--144},
     year = {1978},
     volume = {163},
     zbl = {0372.20025},
     url = {http://geodesic.mathdoc.fr/item/MZ_1978__163_172746/}
}