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  1. Steinberger, H.: Opto-elektronische Systeme: die neuen Erfolgsfaktoren für Pressearchive : Daily Mirror and Daily Express: von der Nachricht zur Information (1990) 10.31 
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  2. Georgy, U.: OPAL - Online Programmes, Digital Archives and Distributed Editorial Collaboration : Austausch von Fernsehbeiträgen via Internet (1999) 10.31 
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  3. »Opal« - das Online-Portal digitalisierter Kulturgüter (2006) 10.31 
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