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Tenopir, C.: Online databases : the new generation of online search software (1993)
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Pritchard-Schoch, T.: Natural language comes of age (1993)
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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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Jascó, P.: Don't kiss Boolean goodbye : it's AND not OR, let alone XOR (1994)
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Sieverts, E.G.; Lobbestael, G.; Groeniger, B.O.; Provost, F.; Sikovà, ?: Software for information storage and retrieval tested, evaluated and compared : pt.5: personal information managers, hypertext and relevance ranking programs (1992)
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