Maristella Agosti Fabio Crestani Gabriella Pasi Lectures on Information Retrieval, Third European Summer-School, ESSIR 2000, Varenna, Italy, September 11-15, 2000, Revised Lectures ESSIR Lecture Notes in Computer Science 1980 Springer 2001 3-540-41933-0 db/conf/essir/essir2000.html