@article{PM_1990_1990_1_a15,
     author = {R{\'\i}o, Angel del},
     title = {Dimensi\'on d\'ebil de anillos de grupo graduados.},
     journal = {Publicacions matem\`atiques},
     pages = {209-216},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_1990_1990_1_a15/}
}