@electronic{www.heidisql.com,
   title       = {HeidiSQL - MySQL made easy}, 
   url         = {http://www.heidisql.com/},
   biburl      = {https://puma.uni-kassel.de/url/b88214939767a39dae7bb4961834c445/benz},
   keywords    = {client free heidisql open_source software sql windows},
   added-at    = {2011-02-09T23:23:06.000+0100},
   description = {HeidiSQL is a powerful and easy client for MySQL. Open source and completely free to use.},
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}

@electronic{blog.kowalczyk.info,
   title       = {Sumatra PDF viewer by Krzysztof Kowalczyk}, 
   url         = {http://blog.kowalczyk.info/software/sumatrapdf/index.html},
   biburl      = {https://puma.uni-kassel.de/url/ff1f7d395ab10f4697cfbbd95c8f75a7/benz},
   keywords    = {free open_source pdf sumatra viewer windows},
   added-at    = {2011-02-04T16:08:15.000+0100},
   description = {Sumatra PDF is a slim, free, open-source PDF viewer for Windows.},
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