@electronic{www.microm-online.de,
   title       = {Sinus-Milieus | Sinus-Studie-Milieus: microm Consumer Marketing}, 
   url         = {http://www.microm-online.de/zielgruppe/strategische-zielgruppen/microm-geo-milieusr/},
   biburl      = {https://puma.uni-kassel.de/url/28efa9ff442921fc84a0a649d539a3ff/stumme},
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@electronic{www.geofabrik.de,
   title       = {GEOFABRIK // Presse}, 
   url         = {http://www.geofabrik.de/geofabrik/press.html},
   biburl      = {https://puma.uni-kassel.de/url/817299928aebb5c632785f25ed8efea1/stumme},
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@electronic{www.gps-mate.de,
   title       = {ConfiTek Ingenieur-Büro L. Oestreicher - Produkte - GPS-Mate}, 
   url         = {http://www.gps-mate.de/de/produkte/GPS-Mate/index.php},
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@electronic{www.twittermap.de,
   title       = {twittermap - Who twitters where}, 
   url         = {http://www.twittermap.de/},
   biburl      = {https://puma.uni-kassel.de/url/db13e5c6b8f4af36a9efe1a87a90817d/stumme},
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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},
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@electronic{www.openstreetmap.de,
   title       = {OpenStreetMap Deutschland :: Hauptseite}, 
   url         = {http://www.openstreetmap.de/index.html},
   biburl      = {https://puma.uni-kassel.de/url/176177141942632ac591edfb90ad214c/stumme},
   keywords    = {geo geotgging karte map},
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@electronic{www.gpsies.com,
   title       = {GPSies.com - Home}, 
   url         = {http://www.gpsies.com/home.do;jsessionid=0327B2D63592F30A97EBCD12C9CB017B#6|51.163475|10.454239},
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@electronic{www.everytrail.com,
   title       = {Everytrail - The GPS Travel Community}, 
   url         = {http://www.everytrail.com/},
   biburl      = {https://puma.uni-kassel.de/url/80eedd50019945ed3b1f6606a1f621f8/stumme},
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@electronic{en.wikipedia.org,
   title       = {GeoTagging - Wikipedia, the free encyclopedia}, 
   url         = {http://en.wikipedia.org/wiki/GeoTagging},
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@electronic{www.makezine.com,
   title       = {MAKE: Blog: HOW TO geotagg del.icio.us bookmarks}, 
   url         = {http://www.makezine.com/blog/archive/2005/07/how_to_geotagg_1.html},
   biburl      = {https://puma.uni-kassel.de/url/e84de8b336564e981ea682bd8c6390bb/stumme},
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