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  1. Egel, J.R.: Großartige Chancen für Verlage und Buchhandlungen (1995) 10.29
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    Author
    Egel, J.R.
  2. Egel, J.R.: Runde Sache : CD-ROM-Lexika nach dem Lifting, elektronische Enzyklopädien etablieren sich (1996) 10.29
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  3. Egel, J.R.: ¬Die Erde ist eine Scheibe : Was die vier am häufigsten verkauften Enzyklopädien auf CD-ROM bieten (2000) 10.29
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    Egel, J.R.