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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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Ongering, H.; Riesthuis, G.J.A.: ¬De ontsluiting in het ADION-systeem : precision en recall (1989)
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