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Jascó, P.: Encarta Concise Encyclopedia (1998)
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English, W.: ¬A short primer in conducting searches (1998)
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King, B.E.; Reinold, K.: Finding the concept, not just the word : a librarian's guide to ontologies and semantics (2008)
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Johnson, K.E.: OPAC missing record retrieval (1996)
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Ruge, G.; Schwarz, C.: Natural language access to free-text data bases (1989)
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