@electronic{www.google.com,
   title       = {Rechenzentren – Google-Rechenzentren}, 
   url         = {http://www.google.com/about/datacenters/gallery/#/},
   biburl      = {https://puma.uni-kassel.de/url/16eff00e23f2d115b246311a71cb8aa8/stumme},
   keywords    = {Google big center data rechenzentren rechenzentrum},
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}

@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},
   keywords    = {Google IR algorithm pagerank},
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@electronic{googleonlinesecurity.blogspot.de,
   title       = {Google Online Security Blog: Street View and reCAPTCHA technology just got smarter}, 
   url         = {http://googleonlinesecurity.blogspot.de/2014/04/street-view-and-recaptcha-technology.html},
   biburl      = {https://puma.uni-kassel.de/url/77d45b9682ef371ea7be0c407be49956/stumme},
   keywords    = {google map maps recaptcha street streetview view},
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@electronic{www.consumingexperience.com,
   title       = {A Consuming Experience: How to backup your Google Calendar automatically, regularly, for free}, 
   url         = {http://www.consumingexperience.com/2010/04/how-to-backup-your-google-calendar.html},
   biburl      = {https://puma.uni-kassel.de/url/a975d8eeae9fe92e5ff40354ab8b6d4b/stumme},
   keywords    = {backup calendar google kalender},
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@electronic{jet.reconinstruments.com,
   title       = {Smartbrille Reckon Jet}, 
   url         = {http://jet.reconinstruments.com/},
   biburl      = {https://puma.uni-kassel.de/url/77e599e211d0d57d94a5d8a354b47af6/stumme},
   keywords    = {Brille Glass Google Smartbrille},
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