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   title       = {writeLaTeX: Online Collaborative LaTeX Editor with Integrated Rapid Preview}, 
   url         = {https://www.writelatex.com/},
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   title       = {ShareLaTeX.com - collaberate of LaTeX documents - ShareLaTeX.com the LaTeX editor in the cloud}, 
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@electronic{docs.latexlab.org,
   title       = {LaTeX Lab - Welcome}, 
   url         = {http://docs.latexlab.org/},
   biburl      = {https://puma.uni-kassel.de/url/93c706ae4ebab706b442901c6c020292/stephandoerfel},
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@electronic{etherpad.com,
   title       = {EtherPad: Realtime Collaborative Text Editing}, 
   url         = {http://etherpad.com/},
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