@article{EXMATH_1998_1998_1_a9,
     author = {Chavarriga, J. and Gin\'e, J.},
     title = {Sistemas integrables mediante un factor de integraci\'on inverso.},
     journal = {Extracta mathematicae},
     pages = {41-60},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1998_1998_1_a9/}
}