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   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},
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@electronic{www.sonatype.com,
   title       = {Maven: The Definitive Guide | Sonatype: Maven and Nexus: Enterprise build and release management}, 
   url         = {http://www.sonatype.com/products/maven/documentation/book-defguide},
   biburl      = {https://puma.uni-kassel.de/url/d77e0e53fdeb17519cf8bf4abaf0d28b/benz},
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@electronic{de.wikipedia.org,
   title       = {Foxit Reader – Wikipedia}, 
   url         = {http://de.wikipedia.org/wiki/Foxit_Reader},
   biburl      = {https://puma.uni-kassel.de/url/3cbcc2bd6c659d95c6086cc32fefbcd3/benz},
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