Roberto Basili 0001 Fabrizio Sebastiani 0001 Giovanni Semeraro Proceedings of the 4th Italian Information Retrieval Workshop, Pisa, Italy, January 16-17, 2013 IIR CEUR-WS.org CEUR Workshop Proceedings 964 2013 https://ceur-ws.org/Vol-964 https://nbn-resolving.org/urn:nbn:de:0074-964-1 db/conf/iir/iir2013.html