@electronic{moz.com,
   title       = {Google Algorithm Change History - Moz}, 
   url         = {http://moz.com/google-algorithm-change},
   biburl      = {https://puma.uni-kassel.de/url/0c6e15e5df8ce314b550986bdc034853/stumme},
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@electronic{www.heise.de,
   title       = {Alternativen zum Marktführer | c't}, 
   url         = {http://www.heise.de/ct/artikel/Googlehagel-290458.html},
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@electronic{inex.is.informatik.uni-duisburg.de,
   title       = {INEX}, 
   url         = {http://inex.is.informatik.uni-duisburg.de/},
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@electronic{www.sigir2008.org,
   title       = {SIGIR'08 - Singapore}, 
   url         = {http://www.sigir2008.org/},
   biburl      = {https://puma.uni-kassel.de/url/6b6740c458415c7b837f7fd72f4aafe5/stumme},
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@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-csli.stanford.edu,
   title       = {Introduction to Information Retrieval}, 
   url         = {http://www-csli.stanford.edu/~schuetze/information-retrieval-book.html},
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