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Voorbij, H.: Wetenschappelijke informatie zoeken op Internet : landelijk gebruikersoderzoek (1998)
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Doek, A.: Antwoord op elke vraag : Bilbiofoon aan een vergelijkend 'warenonderzoek' onderworpen (1994)
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Barry, E.; Bedoya, J.K.; Groom, C.; Patterson, L.: Virtual reference in UK academic libraries : the virtual enquiry project 2008-2009 (2010)
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Tenopir, C.: Electronic reference options : tracking the changes (1995)
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Timman, T.E.; Harte, T.J.M.: Gedeelde ontsluiting : kosten en baten van gezamenlijke catalogiseren door de ministeriebibliotheken (1993)
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