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   title       = {L3S Research Center - staff}, 
   url         = {http://www.l3s.de/english/people/L3S_staff.html},
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   title       = {Forschungszentrum L3S - Publikationen}, 
   url         = {http://www.l3s.de/php/publikation.php},
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@electronic{www.google.com,
   title       = {Rechenzentren – Google-Rechenzentren}, 
   url         = {http://www.google.com/about/datacenters/gallery/#/},
   biburl      = {https://puma.uni-kassel.de/url/16eff00e23f2d115b246311a71cb8aa8/stumme},
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