@incollection{eprints2157,
       booktitle = {Enciclopedia Filosofica},
           title = {Mill, John Stuart},
            year = {2006},
          volume = {8},
       publisher = {Bompiani},
          author = {Stefano Gattei and Vittorio Mathieu},
           pages = {7442--7445},
             url = {http://eprints.imtlucca.it/2157/}
}