@Article{ Villa_MARTÍN_PAYÁ:871-877,

author = { Emilio Villa González and MIGUEL MARTÍN SUÁREZ and RAFAEL PAYÁ ALBERT } ,

title = { NUMERICAL INDEX AND RENORMING },

journal = { PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY },

year = { 2003 },

volume = { 131 },

issn = { 0002-9939 },

pages = { 871-877 },

}