@electronic{www.kde.cs.uni-kassel.de,
   title       = {Seminar: Internet-Suchmaschinen oder die Hommingberger Gepardenforelle}, 
   url         = {http://www.kde.cs.uni-kassel.de/lehre/ss2005/googlespam/},
   biburl      = {https://puma.uni-kassel.de/url/f5aa13667e778fa3639e2742e7acce4b/stumme},
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@electronic{www.hommingberger-gepardenforelle.de,
   title       = {Hommingberger Gepardenforelle – Startseite}, 
   url         = {http://www.hommingberger-gepardenforelle.de/},
   biburl      = {https://puma.uni-kassel.de/url/c54aab5dedcdff289b7f50ff03361489/stumme},
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@electronic{de.wikipedia.org,
   title       = {Hommingberger Gepardenforelle - Wikipedia}, 
   url         = {http://de.wikipedia.org/wiki/Hommingberger_Gepardenforelle},
   biburl      = {https://puma.uni-kassel.de/url/aedaf886362e3887ef44588d9afc317b/stumme},
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@electronic{www.heise.de,
   title       = {c't - SEO-Wettbewerb}, 
   url         = {http://www.heise.de/ct/SEO-Wettbewerb/},
   biburl      = {https://puma.uni-kassel.de/url/1ec5cacadeb907385fff124ea41aff97/stumme},
   keywords    = {gepardenforelle hommingberger seo},
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