@electronic{www.twittermap.de,
   title       = {twittermap - Who twitters where}, 
   url         = {http://www.twittermap.de/},
   biburl      = {https://puma.uni-kassel.de/url/db13e5c6b8f4af36a9efe1a87a90817d/stumme},
   keywords    = {everyaware geo geolocation location map twitter},
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@electronic{www.geographie.uni-bonn.de,
   title       = {OSM-3D Germany}, 
   url         = {http://www.geographie.uni-bonn.de/karto/osm-3d/Start.en.htm},
   biburl      = {https://puma.uni-kassel.de/url/ec53f4f72a748252632e37b79237b8e0/stumme},
   keywords    = {data everyaware openstreetmap osm sensor sensordata},
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@electronic{www.gpsbusinessnews.com,
   title       = {Twitter to get geolocation}, 
   url         = {http://www.gpsbusinessnews.com/Twitter-to-get-geolocation_a1688.html},
   biburl      = {https://puma.uni-kassel.de/url/b1762d9edf72e6df9658208e17029874/stumme},
   keywords    = {everyaware geo geolocation twitter},
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@electronic{noisetube.net,
   title       = {::NoiseTube::}, 
   url         = {http://noisetube.net/},
   biburl      = {https://puma.uni-kassel.de/url/6f7ad47745a7c904b5e9f9898e398bd6/hotho},
   keywords    = {everyaware ht09 noise noisetube presentation recognition sony tools},
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