@electronic{www.smashingmagazine.com,
   title       = {Cheat Sheet Round-Up: Ajax, CSS, LaTeX, Ruby… | Web-Tools}, 
   url         = {http://www.smashingmagazine.com/2006/10/30/cheat-sheet-round-up-ajax-css-latex-ruby/},
   biburl      = {https://puma.uni-kassel.de/url/2721cb20cf0258790d6eb3b39c1b322e/hotho},
   keywords    = {ajax cheat css html java programming sheet web},
   added-at    = {2007-09-04T13:38:30.000+0200},
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@electronic{www.squarefree.com,
   title       = {Real-time HTML Editor}, 
   url         = {http://www.squarefree.com/htmledit/},
   biburl      = {https://puma.uni-kassel.de/url/3a857555f0eee4b411b0c96146b68118/hotho},
   keywords    = {html ajax demo editor},
   added-at    = {2006-02-13T15:00:05.000+0100},
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