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![Cover for Ralf Bruser · Viral Marketing in Social Media: Planung, Seeding und Steuerung (Paperback Book) [German edition] (2014)](https://imusic.b-cdn.net/images/item/original/104/9783954253104.jpg?ralf-bruser-2014-viral-marketing-in-social-media-planung-seeding-und-steuerung-paperback-book&class=scaled&v=1458128701)
![Cover for Ralf Bruser · Planung, Seeding und Steuerung von Viral Marketing im Social Web (Paperback Book) [German edition] (2013)](https://imusic.b-cdn.net/images/item/original/375/9783656517375.jpg?ralf-bruser-2013-planung-seeding-und-steuerung-von-viral-marketing-im-social-web-paperback-book&class=scaled&v=1408560685)