@electronic{www.heise.de,
   title       = {heise online - Umfrage: 30 Millionen Deutsche im Social Web}, 
   url         = {http://www.heise.de/newsticker/meldung/Umfrage-30-Millionen-Deutsche-im-Social-Web-954882.html},
   biburl      = {https://puma.uni-kassel.de/url/9faade34bf479b06998b08170c39897b/benz},
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@electronic{scientometrics.wordpress.com,
   title       = {Germany pass-networks (against Australia) – 2010 FIFA World Cup « Scientometrics, Knowledge Management, and Social Network Analysis}, 
   url         = {http://scientometrics.wordpress.com/2010/07/04/ger-pass-network-vs-aus/},
   biburl      = {https://puma.uni-kassel.de/url/a37eea22a401a3bfacbec4ae8e07df3a/hotho},
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@electronic{www.goyellow.de,
   title       = {Kartensuche | GoYellow.de}, 
   url         = {http://www.goyellow.de/map/},
   biburl      = {https://puma.uni-kassel.de/url/c1b0b4a909023407851d274f97feceac/hotho},
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@electronic{www.gesetze-im-internet.de,
   title       = {juris BMJ - Startseite}, 
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   biburl      = {https://puma.uni-kassel.de/url/b477ddf7c7b9704b24b8a83e105587c9/hotho},
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