@electronic{stackoverflow.com,
   title       = {Stack Overflow}, 
   url         = {http://stackoverflow.com/},
   biburl      = {https://puma.uni-kassel.de/url/e4a42d992025b928a586b8bdc36ad38d/stephandoerfel},
   keywords    = {community forum programming stackoverflow},
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@electronic{blog.stackoverflow.com,
   title       = {Stack Overflow Creative Commons Data Dump - Blog – Stack Overflow}, 
   url         = {http://blog.stackoverflow.com/2009/06/stack-overflow-creative-commons-data-dump/},
   biburl      = {https://puma.uni-kassel.de/url/a7fa4f7d006797bc78d35471f0a06c51/benz},
   keywords    = {data dataset stackoverflow},
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