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![Cover for Michael Jeske · Audiokonferenzen mittels VoIP unter Verwendung von Open Source Software (Paperback Book) [German edition] (2010)](https://imusic.b-cdn.net/images/item/original/748/9783640613748.jpg?michael-jeske-2010-audiokonferenzen-mittels-voip-unter-verwendung-von-open-source-software-paperback-book&class=scaled&v=1408395558)