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   title       = {How to make a presentation with Latex - Introduction to Beamer - math-linux.com}, 
   url         = {http://www.math-linux.com/spip.php?article77},
   biburl      = {https://puma.uni-kassel.de/url/ccc69b23c1134831f6f62f260d8994a9/stumme},
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   title       = {LaTeX: Beamer-Klasse}, 
   url         = {http://www2.informatik.hu-berlin.de/~mischulz/beamer.html},
   biburl      = {https://puma.uni-kassel.de/url/44fd2db82aa8b933dd5ac2b02e0666b4/stumme},
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@electronic{www.informatik.uni-freiburg.de,
   title       = {Beispiel für eine gute Präsentation mit Latex Beamer Class von Sascha Frank}, 
   url         = {http://www.informatik.uni-freiburg.de/~frank/latex-kurs/latex-kurs-3/beamer-class-beispiel-4.html},
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