@incollection{eprints2154,
       booktitle = {Enciclopedia Filosofica},
           title = {Definizione},
       publisher = {Bompiani},
          volume = {3},
            year = {2006},
          author = {Stefano Gattei and Joseph Dopp},
           pages = {2597--2605},
             url = {http://eprints.imtlucca.it/2154/}
}