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Ongering, H.; Riesthuis, G.J.A.: ¬De ontsluiting in het ADION-systeem : precision en recall (1989)
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Voorbij, H.: Titelwoorden - trefwoorden : een vergelijkend onderzoek (1997)
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Voorbij, H.: ¬Een goede titel behoeft geen trefwoord, of toch wel? : een vergelijkend oderzoek titelwoorden - trefwoorden (1997)
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