@article{PM_1996_1996_1_a12,
     author = {Chavarriga, Javier and Gin\'e, Jaume},
     title = {Integrabilidad de un centro lineal con perturbaci\'on por un polinomio homog\'eneo de cuarto grado.},
     journal = {Publicacions matem\`atiques},
     pages = {21-39},
     publisher = {mathdoc},
     volume = {40},
     number = {1},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_1996_1996_1_a12/}
}