@article{PM_1999_1999_1_a17,
     author = {Dumortier, Freddy and Ib\'a\~nez, Santiago},
     title = {Singularidades de codimensi\'on 4 en campos de vectores sobre el plano sim\'etricos reflexivos.},
     journal = {Publicacions matem\`atiques},
     pages = {501-533},
     publisher = {mathdoc},
     volume = {43},
     number = {2},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_1999_1999_1_a17/}
}