Evaluation of Multilingual and Multi-modal Information Retrieval : 7th Workshop of the Cross-Language Evaluation Forum, CLEF 2006, Alicante, Spain, September 20-22, 2006, Revised Selected Papers - Carol Peters, Paul Clough, Fredric C. Gey, Jussi Karlgren, Bernardo Magnini, Douglas W. Oard, Maarten Rijke, . Maximilian Stempfhuber ((Lecture Notes in Computer Science))