@article{QUE_1989_1989_1_a7,
     author = {Capilla Rom\'a, Carmen and Romero Villafranca, Rafael},
     title = {Tama\~no y frecuencia de muestreo en gr\'aficos de control.},
     journal = {Q\"uestii\'o},
     publisher = {mathdoc},
     volume = {13},
     year = {1989},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/QUE_1989_1989_1_a7/}
}