@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},
   keywords    = {computer latex software tex texlive textsatz},
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