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  1. Lewis, D.D.; Sparck Jones, K.: Natural language processing for information retrieval (1996) 10.09 
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  2. Lewis, D.D.: ¬The TREC-4 filtering track (1996) 10.09 
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  3. Lewis, D.D.; Sparck Jones, K.: Natural language processing for information retrieval (1997) 10.09 
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  4. Lewis, D.D.: ¬The TREC-5 filtering track (1997) 10.09 
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