Lectures on Information Retrieval Third European Summer-School, ESSIR 2000 Varenna, Italy, September 11-15, 2000. Revised Lectures - Agosti, Maristella; Agosti, Maristella; Crestani, Fabio; Crestani, Fabio; Pasi, Gabriella; Pasi, Gabriella (Springer Berlin Heidelberg : Imprint: Springer, 2001)