@electronic{reality.media.mit.edu,
   title       = {MIT Media Lab: Reality Mining}, 
   url         = {http://reality.media.mit.edu/},
   biburl      = {https://puma.uni-kassel.de/url/365294ebae4828f93aca9d32ab116908/hotho},
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@electronic{www.openstreetmap.de,
   title       = {OpenStreetMap: Die freie Wiki-Weltkarte}, 
   url         = {http://www.openstreetmap.de/},
   biburl      = {https://puma.uni-kassel.de/url/f8933284f909861eddf344e32d55da85/stumme},
   keywords    = {Weltkarte gps karte straßenkarte trace traces},
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