@electronic{www.gps-tour.info,
   title       = {GPS-Tour.info}, 
   url         = {http://www.gps-tour.info/},
   biburl      = {https://puma.uni-kassel.de/url/c5e599338f405b0921b8bc83f5b56267/stumme},
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@electronic{www.ted.com,
   title       = {Adventures in mapping | Playlist | TED.com}, 
   url         = {http://www.ted.com/playlists/138/adventures_in_mapping},
   biburl      = {https://puma.uni-kassel.de/url/a840010e36e41b5682239a35f354bfbd/stumme},
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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},
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@electronic{mapstory.org,
   title       = {MapStory : Welcome!}, 
   url         = {http://mapstory.org/},
   biburl      = {https://puma.uni-kassel.de/url/9cd562e7bda8d5397ed3b968037cd78f/stumme},
   keywords    = {Karte Karten map maps mapstoryosm},
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@electronic{www.flightradar24.com,
   title       = {Flightradar24.com - Live flight tracker!}, 
   url         = {http://www.flightradar24.com/},
   biburl      = {https://puma.uni-kassel.de/url/70267f68e3aa6474ce288651545b8250/stumme},
   keywords    = {airplane everyaware flight flug fluglärm flugzeuge lärm maps noise pollution traffic travel visualization},
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@electronic{techcrunch.com,
   title       = {SoLoMo: CityMaps Nabs $2.5M To Render Your City Social, One Block At A Time | TechCrunch}, 
   url         = {http://techcrunch.com/2012/03/19/citymaps-series-a-and-launch/},
   biburl      = {https://puma.uni-kassel.de/url/c3747341d9108f8474cbebb03b39bf6f/stumme},
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@electronic{sautter.com,
   title       = {transparent map comparison openstreetmap google yahoo}, 
   url         = {http://sautter.com/map/},
   biburl      = {https://puma.uni-kassel.de/url/6d8531334267794c89b35f5c496f749e/stumme},
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@electronic{unterbahn.com,
   title       = {Unterbahn » Blog Archive » Serving ‘OSM-JSON’ alongside XML from the OpenStreetMap Rails port}, 
   url         = {http://unterbahn.com/2009/07/serving-osm-json-alongside-xml-from-the-openstreetmap-rails-port/},
   biburl      = {https://puma.uni-kassel.de/url/b8ffb098ea5fbfbfc44cd823f5d9e982/stumme},
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