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Schumacher, D.: Marketing für Informationen und Informationsdienstleistungen : die Konkurrenz öffentlicher und privater Informationsdienstleister (1991)
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Bocek, K.; Bhattacharjee, E.; Ockenfeld, M.; Genth, P.; Herget, J.; Neißer, H.; Nerlich, H.; Rittberger, M.; Schumacher, D.: "Fachinformation und Fachkommunikation in der Informations- und Wissensgesellschaft - Eckwerte für eine neue Fachinformationspolitik in der Bundesrepublik" vom September 1999 : Stellungnahme der DGI zu den Eckwerten des Arbeitskreises "Zukunft der Fachinformation" (2000)
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Schumacher, D.: ¬Ein Bollwerk für die abendländische Informationskultur : Bericht zur Lage der Nation 1999 (1999)
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Schumacher, D.: Zum Untergang abendländinscher Informationskultur durch das Internet : eine Herausforderung für Professionals und ihre Kunden (1998)
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Schumacher, D.: Zur Philosophie der Informationswirtschaft : Bericht zur Lage der Nation (2004) (2004)
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