@electronic{amath.colorado.edu,
   title       = {Latex: A4 paper vs. letter paper}, 
   url         = {http://amath.colorado.edu/documentation/LaTeX/reference/faq/a4.html},
   biburl      = {https://puma.uni-kassel.de/url/4424211aa6d3b8d666622961c37631f2/benz},
   keywords    = {a4 dvips howto latex letter letterpaper papersize pdf},
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@electronic{stackoverflow.com,
   title       = {Passing command-line arguments to LaTeX document - Stack Overflow}, 
   url         = {http://stackoverflow.com/questions/1465665/passing-command-line-arguments-to-latex-document},
   biburl      = {https://puma.uni-kassel.de/url/06680b3301c83408fdffabfb6876af9d/benz},
   keywords    = {arguments command_line howto latex manual pdflatex reference},
   added-at    = {2011-02-04T16:07:26.000+0100},
   description = {That is, can I pass latex some command-line arguments so that I can choose which style to use based on that argument?},
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@electronic{hstuart.dk,
   title       = {Drawing trees in LaTeX | Stuart's Soliloquy to the void}, 
   url         = {http://hstuart.dk/2007/02/21/drawing-trees-in-latex/},
   biburl      = {https://puma.uni-kassel.de/url/acd40b8117a7c3d241eb582bb780c923/benz},
   keywords    = {draw howto latex tex tikz tree},
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