@article{QUE_1988_1988_1_a2,
     author = {Pepio Vi\~nals, M. and Polo, C.},
     title = {Control de calidad por sumas acumuladas.},
     journal = {Q\"uestii\'o},
     pages = {43-57},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1988},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/QUE_1988_1988_1_a2/}
}