@electronic{google.de,
   title       = {google}, 
   url         = {http://google.de},
   biburl      = {https://puma.uni-kassel.de/url/c25f006c874b47c0f3741f4878805264/tode},
   keywords    = {google},
   added-at    = {2014-01-28T08:27:18.000+0100},
   description = {},
   interhash   = {c25f006c874b47c0f3741f4878805264}, 
   intrahash   = {c25f006c874b47c0f3741f4878805264}
}

@electronic{puma.uni-kassel.de,
   title       = {PUMA :: Buttons}, 
   url         = {http://puma.uni-kassel.de/buttons},
   biburl      = {https://puma.uni-kassel.de/url/1f9d89aace2e92efe1f768df5e2b592b/tode},
   keywords    = {puma},
   added-at    = {2014-01-28T08:24:54.000+0100},
   description = {},
   interhash   = {1f9d89aace2e92efe1f768df5e2b592b}, 
   intrahash   = {1f9d89aace2e92efe1f768df5e2b592b}
}