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Tenopir, C.: Online databases : natural language searching with WIN (1993)
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Hersh, W.R.; Hickam, D.H.: ¬An evaluation of interactive Boolean and natural language searching with an online medical textbook (1995)
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Feldman, S.: Testing natural language : comparing DIALOG, TARGET, and DR-LINK (1996)
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Jascó, P.: Don't kiss Boolean goodbye : it's AND not OR, let alone XOR (1994)
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Scoville, R.: Find it on the net (1996)
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