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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)
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Perez-Carballo, J.; Strzalkowski, T.: Natural language information retrieval : progress report (2000)
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Strzalkowski, T.; Perez-Carballo, J.: Natural language information retrieval : TREC-4 report (1996)
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