i-TEL-u: A Query Suggestion Tool for Integrating Heterogeneous Contexts in a Digital Library - Maristella Agosti; Davide Cisco; Giorgio Maria Di Nunzio; Ivano Masiero; Massimo Melucci (Research and Advanced Technology for Digital Libraries, 14th European Conference, ECDL 2010, Glasgow, UK, September 6-10, 2010. Proceedings, 2010)