@electronic{www.geofabrik.de,
   title       = {GEOFABRIK // Presse}, 
   url         = {http://www.geofabrik.de/geofabrik/press.html},
   biburl      = {https://puma.uni-kassel.de/url/817299928aebb5c632785f25ed8efea1/stumme},
   keywords    = {geo map osm},
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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.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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