@electronic{joda.org,
   title       = {Joda}, 
   url         = {http://joda.org/},
   biburl      = {https://puma.uni-kassel.de/url/15998e9e5efeaa8b5f772323fece28ce/benz},
   keywords    = {core java joda library optimization},
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@electronic{dev.mysql.com,
   title       = {MySQL AB :: MySQL Presentations: Optimizing MySQL}, 
   url         = {http://dev.mysql.com/tech-resources/presentations/presentation-oscon2000-20000719/},
   biburl      = {https://puma.uni-kassel.de/url/d370899b7abf8cc28bd43518d1f576a3/hotho},
   keywords    = {hints mysql optimization},
   added-at    = {2005-11-03T12:04:24.000+0100},
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