@electronic{merkel.zoneo.net,
   title       = {Natbib reference sheet}, 
   url         = {http://merkel.zoneo.net/Latex/natbib.php},
   biburl      = {https://puma.uni-kassel.de/url/e6f023aa4e59df83a7502724ae7b4716/droessler},
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@electronic{lefti.amigager.de,
   title       = {LaTeX-Sonderzeichen}, 
   url         = {http://lefti.amigager.de/latex/Matlist.html},
   biburl      = {https://puma.uni-kassel.de/url/f342ec2b9eef8404aa1fa209c3ce039c/droessler},
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@electronic{www.tug.org,
   title       = {The TeX Live Guide TeX Live 2011}, 
   url         = {http://www.tug.org/texlive/doc/texlive-en/texlive-en.html},
   biburl      = {https://puma.uni-kassel.de/url/2625aa3d0e40ec75b01e0c30efd66017/droessler},
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@electronic{www.tug.org,
   title       = {TeX Live - TeX Users Group}, 
   url         = {http://www.tug.org/texlive/},
   biburl      = {https://puma.uni-kassel.de/url/3e8f87925b897338a010335b3079256b/droessler},
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@electronic{latex.hpfsc.de,
   title       = {Überblick Latex (Tex) Tutorial}, 
   url         = {http://latex.hpfsc.de/content/latex_tutorial},
   biburl      = {https://puma.uni-kassel.de/url/b4a044336b207f7cfc26631d23dc0e8b/droessler},
   keywords    = {latex software textverarbeitung},
   added-at    = {2011-11-01T10:55:28.000+0100},
   description = {Eine kleine Latex (Tex) Einführung},
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