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Hawkins, D.T.: Growth trends in the electronic information services market (1994)
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Hawkins, D.T.: Growth trends in the electronic information services market (1993)
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Nicholls, P.; Sutherland, T.: CD-ROM databases : a survey of commercial publishing activity (1992)
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Delfino, E.: ¬The basics on setting up an electronic bulletin board system (1993)
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Courage, M.-A.; Butrimenko, A.: Electronic information market in Eastern Europe 1995, state of affairs and trends (1996)
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