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Strzalkowski, T.; Guthrie, L.; Karlgren, J.; Leistensnider, J.; Lin, F.; Perez-Carballo, J.; Straszheim, T.; Wang, J.; Wilding, J.: Natural language information retrieval : TREC-5 report (1997) 0.03

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Gauch, S.; Wang, J.: Corpus analysis for TREC 5 query expansion (1997) 0.02

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