1. Lecture Notes in Computer Science;A. Ageno,2005
2. Brill, E., Lin, J., Banko, M., Dumais, S., Ng, A.: Data-intensive Question Answering. In: TREC 2001 Proceedings (2001)
3. Del-Castillo, A., Montes-y-Gómez, M., Villaseñor-Pineda, L.: QA on the web: A prelimi-nary study for Spanish language. In: Proceedings of the 5th Mexican International Conference on Computer Science (ENC 2004), Colima, Mexico (2004)
4. Lecture Notes in Artificial Intelligence;J.M. Gómez-Soriano,2005
5. Jijkoun, V., Mishne, G., de Rijke, M., Schlobach, S., Ahn, D., Müller, K.: The University of Amsterdam at QA@CLEF 2004. In: Working Notes for the CLEF 2004 Workshop, Bath, UK (2004)