@article{QUE_1996_1996_1_a20,
     author = {Ferri, Francesc J. and Albert, Jes\'us},
     title = {An\'alisis de clases de selecci\'on usando relaciones de recurrencia.},
     journal = {Q\"uestii\'o},
     pages = {111-119},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/QUE_1996_1996_1_a20/}
}