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Hofstede, M.: Literatuur over onderwerpen zoeken in de OPC (1994)
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Donkersloot, H.B.: Zoeken op titelwoorden : een oderzoek met de on-line publiekscatalogus (1985)
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Robertson, S.E.; Walker, S.; Beaulieu, M.: Experimentation as a way of life : Okapi at TREC (2000)
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Peters, T.A.; Kurth, M.: Controlled and uncontrolled vocabulary subject searching in an academic library online catalog (1991)
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Cooper, M.D.; Chen, H.-M.: Predicting the relevance of a library catalog search (2001)
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