@article{PM_1997_1997_1_a11,
     author = {Art\'es, Joan C. and Llibre, Jaume},
     title = {Campos vectoriales cuadr\'aticos con un foco d\'ebil de tercer orden.},
     journal = {Publicacions matem\`atiques},
     pages = {7-39},
     year = {1997},
     volume = {41},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_1997_1997_1_a11/}
}