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Shapiro, C.D.; Yan, P.-F.: Generous tools : thesauri in digital libraries (1996)
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Chen, H.; Martinez, J.; Kirchhoff, A.; Ng, T.D.; Schatz, B.R.: Alleviating search uncertainty through concept associations : automatic indexing, co-occurence analysis, and parallel computing (1998)
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Spiteri, L.F.: ¬The essential elements of faceted thesauri (1999)
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