\begin{quote}
- Copyright \copyright\ 2000-2001 Simone Piccardi. Permission is granted to
+ Copyright \copyright\ 2000-2002 Simone Piccardi. Permission is granted to
copy, distribute and/or modify this document under the terms of the GNU Free
Documentation License, Version 1.1 or any later version published by the
Free Software Foundation; with the Invariant Sections being ``Prefazione'',
%\bibliography{biblio}
\printindex
+\bibliographystyle{alpha}
+\bibliography{biblio}
+
\end{document}