@electronic{www.computerposter.ch,
   title       = {Das Poster - Le Poster – The Poster - Il Poster}, 
   url         = {http://www.computerposter.ch/},
   biburl      = {https://puma.uni-kassel.de/url/0031bdeb0bf97f1912e6268e0a04cfb6/hotho},
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@electronic{www.einstieg-informatik.de,
   title       = {Einstieg Informatik | Home}, 
   url         = {http://www.einstieg-informatik.de/},
   biburl      = {https://puma.uni-kassel.de/url/6924cbec20363d83bf41f770ac1726bd/hotho},
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@electronic{zoomii.com,
   title       = {Zoomii.com - The "Real" Online Bookstore}, 
   url         = {http://zoomii.com/#},
   biburl      = {https://puma.uni-kassel.de/url/5745923fd09bd723cda289daa814964d/hotho},
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@electronic{blog.magix.com,
   title       = {MAGIX Blog - Das deutsche Social Media Prisma}, 
   url         = {http://blog.magix.com/de/archives/783-Das-deutsche-Social-Media-Prisma.html},
   biburl      = {https://puma.uni-kassel.de/url/aecc853825bcdd5b1f44f5da386fc043/hotho},
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@electronic{www.informatik.uni-freiburg.de,
   title       = {Computer-based New Media, Institute for Computer Science, University of Freiburg}, 
   url         = {http://www.informatik.uni-freiburg.de/cgnm/lehre/rs-04s/references_en.html},
   biburl      = {https://puma.uni-kassel.de/url/11118f36e4267909a5225ce98ca982d4/hotho},
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