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Umstätter, W.: Interpersonal Computing im Internet (1994) 0.13

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Source: Information und Medienvielfalt: 16. Online-Tagung der DGD, Frankfurt am Main, 17.-19.5.1994. Proceedings. Hrsg.: W. Neubauer u. R. Schmidt

Umstätter, W.: Anwendung von Internet : eine Einführung (1995) 0.01

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Umstätter, W.: ¬Die Zukunft des Buches (1998) 0.00

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