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  1. Heiser, W.J.: Zoeken in de bibliografische ruimte : de bijzondere rol van de hierarchische classificaties bij geautomatiseerde onderwerpsontsluiting (1993) 0.12
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  2. 7e Dag van het Document : 19 & 20 mei 1998, Congrescentrum De Reehorst, Ede ; proceedings (1998) 0.01
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