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Schwuchow, W.; Graumann, S.; Bredemeier, W.: ¬A study of the European information services market (1997) 4.07

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Bredemeier, W.; Schwuchow, W.: ¬Der Markt für elektronische Konsumentendienste und seine Bedeutung im Gesamtmarkt für elektronische Informationsdienste in Deutschland (1997) 4.07

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