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  1. Voorhees, E.M.: Question answering in TREC (2005) 8.41 
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  2. Ferret, O.; Grau, B.; Hurault-Plantet, M.; Illouz, G.; Jacquemin, C.; Monceaux, L.; Robba, I.; Vilnat, A.: How NLP can improve question answering (2002) 8.41 
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