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Pritchard-Schoch, T.: Natural language comes of age (1993)
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Khoo, C.S.G.; Wan, K.-W.: ¬A simple relevancy-ranking strategy for an interface to Boolean OPACs (2004)
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Pfeifer, U.; Fuhr, N.; Huynh, T.: Searching structured documents with the enhanced retrieval functionality of freeWAIS-sf and SFgate (1995)
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Tenopir, C.: Online databases : natural language searching with WIN (1993)
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Iyer, H.: Semantic interpretation of conjuncts : Boolean transformations (1992)
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