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Curle, D.: There's no value if it's not relevant : Online information pricing will make sense when online products do (1998)
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Benkowsky, J.; Bühring, B.; Georgy, U.; Linde, F.: Information pricing : the development of a product- and pricing concept for the research centre of the Public Library Cologne (2005)
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Flynn, M.: Marketing a fee-based information service : the case of BTiS (1994)
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Riehm, S.M.: ¬A first look at FirstSearch (1992)
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Falk, H.: World Wide Web search and retrieval (1997)
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