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Smith, I.A.; O'Brien, A.: Signposts to information : keywords, indexes and thesauri (1993)
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Nielsen, M.L.: Future thesauri : what kind of conceptual knowledge do searchers need? (1998)
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Rada, R.: Connecting and evaluating thesauri : issues and cases (1987)
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Spiteri, L.F.: ¬The essential elements of faceted thesauri (1999)
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Pollitt, A.S.: ¬The key role of classification and indexing in view-based searching (1998)
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