@electronic{www.pcwelt.de,
   title       = {Android wieder schnell wie am ersten Tag - Smartphone aufräumen - Apps & Mobile - PC-WELT}, 
   url         = {http://www.pcwelt.de/ratgeber/Android_wieder_schnell_wie_am_ersten_Tag-Smartphone_aufraeumen-7837689.html},
   biburl      = {https://puma.uni-kassel.de/url/1272b0bcacc06bf8d1682f9f9844b912/stumme},
   keywords    = {android apps aufräumen smartphone},
   added-at    = {2014-01-20T21:14:50.000+0100},
   description = {},
   interhash   = {1272b0bcacc06bf8d1682f9f9844b912}, 
   intrahash   = {1272b0bcacc06bf8d1682f9f9844b912}
}

@electronic{ispex.nl,
   title       = {iSPEX: meet fijnstof met je smartphone}, 
   url         = {http://ispex.nl/},
   biburl      = {https://puma.uni-kassel.de/url/d59751b1f675de6310e680f384dcf515/stumme},
   keywords    = {aerosol everyaware iphone ispex particle sensor smartphone},
   added-at    = {2012-11-01T14:08:35.000+0100},
   description = {},
   interhash   = {d59751b1f675de6310e680f384dcf515}, 
   intrahash   = {d59751b1f675de6310e680f384dcf515}
}