@article{QUE_1999_1999_1_a1,
     author = {Dur\'an R\'ubies, Josep Maria},
     title = {Modelos gr\'aficos de independencia.},
     journal = {Q\"uestii\'o},
     pages = {171-192},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {1999},
     url = {http://geodesic.mathdoc.fr/item/QUE_1999_1999_1_a1/}
}