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  1. Handbuch der Telekommunikation (1994-) 0.07 
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  2. Kropp, H.: DFÜ: sämtliche Einsatzmöglichkeiten der Fernsprech- und Datexdienste : aktuelles Nachschlagewerk mit Musterlösungen für die rationelle Nutzung der Postdienste und Erfahrungsberichte aus der Praxis (1988) 0.07 
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  3. Rentrop, N.; Sackmann, H.-J.: ¬Der Telekommunikations-Berater (1993) 0.06 
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  4. Schulte, H.: Telekommunikation (1993) 0.03 
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