@electronic{www.google.com,
   title       = {Google Map Maker}, 
   url         = {http://www.google.com/mapmaker},
   biburl      = {https://puma.uni-kassel.de/url/96e34c574e1099c5468ba1d8884d9340/benz},
   keywords    = {google maker map mapmaker},
   added-at    = {2011-04-19T23:23:05.000+0200},
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}

@electronic{www.phys.uniroma1.it,
   title       = {Dip. Fisica - Univ. "La Sapienza" - Roma}, 
   url         = {http://www.phys.uniroma1.it/DipWeb/home.html},
   biburl      = {https://puma.uni-kassel.de/url/50c0f72e165e79dc360e1c4eea3b9000/benz},
   keywords    = {department location map physics university_rome},
   added-at    = {2011-02-04T16:08:49.000+0100},
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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/benz},
   keywords    = {map twitter},
   added-at    = {2011-02-04T16:08:10.000+0100},
   description = {},
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}