@article{BUMI_2004_8_7B_2_a0,
     author = {Valla, Giuseppe},
     title = {Numerical characters of graded algebras},
     journal = {Bollettino della Unione matematica italiana},
     pages = {257--274},
     publisher = {mathdoc},
     volume = {Ser. 8, 7B},
     number = {2},
     year = {2004},
     zbl = {1177.13035},
     mrnumber = {1150603},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2004_8_7B_2_a0/}
}