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Herrera, Jesús and Peñas, Anselmo and Verdejo, Felisa (2005) Question answering pilot task at CLEF 2004. In Multilingual Information Access for Text, Speech and Images: 5th Workshop of the Cross-Language Evaluation Forum, CLEF 2004, Bath, UK. Lecture Notes in Computer Science, 3491 . Springer-Verlag, Berlin, pp. 581-590. ISBN 3 540 27420 0