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  1. Neumann, G.: Online-Recherchen in der Schulbibliothek : Btx als Umwelt-Informationsquelle (1995) 7.75
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  2. Strauch, D.: Bildschirmtext (1990) 7.75
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  3. Spiller, R.: Bildschirmtext-Externer Rechner und das Informationssystem IBAS (1984) 7.75
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  4. Stapenhorst, F.: Vom Feldweg zum Datenhighway : was T-Online Unternehmen bietet (1997) 7.75
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  5. Mahnkopf, P.: Endkundensysteme in T-Online, Datex-J, Btx (1997) 7.75
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  6. ¬Die Erfolgsstory : 20 Jahre Btx und T-Online (1997) 7.75
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  7. Zimmer, J.: Online-Dienste auf dem Weg zum MAssenmedium? : Entwicklung und Nutzung von Online-Diensten in Deutschland (1996) 7.75
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  8. Lorenz, F.: Btx stirbt auf Raten (2000) 7.75
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