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Voorbij, H.: Titelwoorden - trefwoorden : een vergelijkend onderzoek (1997)
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Voorbij, H.: Wetenschappelijke informatie zoeken op Internet : landelijk gebruikersoderzoek (1998)
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Voorbij, H.: ¬De ontwikkeling van het onderwerpsontsluitingssysteem t.b.v. de Nederlandse Bibliografie (1981)
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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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Voorbij, H.: Searching scientific information on the Internet : a Dutch academic user survey (1999)
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Voorbij, H.: Title keywords and subject descriptors : a comparison of subject search entries of books in the humanities and social sciences (1998)
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