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Mahnkopf, P.: Endkundensysteme in T-Online, Datex-J, Btx (1997)
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¬Die Erfolgsstory : 20 Jahre Btx und T-Online (1997)
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Zimmer, J.: Online-Dienste auf dem Weg zum MAssenmedium? : Entwicklung und Nutzung von Online-Diensten in Deutschland (1996)
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Lorenz, F.: Btx stirbt auf Raten (2000)
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