@article{QUE_1997_1997_1_a8,
     author = {Mayor Gallego, Jos\'e A.},
     title = {Estimadores de raz\'on: una revisi\'on.},
     journal = {Q\"uestii\'o},
     pages = {109-149},
     year = {1997},
     volume = {21},
     number = {1-2},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/QUE_1997_1997_1_a8/}
}