@article{TE_1991_1991_1_a0,
     author = {Ruiz Espejo, Mariano},
     title = {Comparaci\'on de estimadores \'optimos de raz\'on, producto y regresi\'on.},
     journal = {Trabajos de estad{\'\i}stica},
     pages = {81-87},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1991},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/TE_1991_1991_1_a0/}
}