Italian translation by Cinzia Bucchioni of the article "Reference Linking in a Hybrid Library Environment, Part 1: Frameworks for Linking by Herbert Van de Sompel and Patrick Hochstenbach". Published in D-Lib Magazine, April 1999, Volume 5 Issue 4, ISSN 1082-9873 http://www.dlib.org/dlib/april99/van_de_sompel/04van_de_sompel-pt1.html