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Hofstede, M.: Literatuur over onderwerpen zoeken in de OPC (1994)
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Riesthuis, G.J.A.: Vrije tekst en gecontroleerd vocabulaires (1999)
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Riesthuis, G.J.A.: Zoeken met woorden : hergebruik van onderwerpsontsluiting (1998)
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Waal, J. d.: genre-indeling van digitale media : Nieuwe media passen niet in SISO (1995)
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