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Tenopir, C.: Online databases : natural language searching with WIN (1993)
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Pritchard-Schoch, T.: Comparing natural language retrieval : Win & Freestyle (1995)
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Samstag-Schnock, U.; Meadow, C.T.: PBS: an ecomical natural language query interpreter (1993)
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Chowdhury, G.G.: Natural language processing (2002)
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Paris, L.A.H.; Tibbo, H.R.: Freestyle vs. Boolean : a comparison of partial and exact match retrieval systems (1998)
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