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   title       = {CRAN - Package randomForest}, 
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@electronic{en.wikipedia.org,
   title       = {Conditional random field - Wikipedia, the free encyclopedia}, 
   url         = {http://en.wikipedia.org/wiki/Conditional_random_field},
   biburl      = {https://puma.uni-kassel.de/url/28f87c272fd1a36091f27335a7f826d5/stephandoerfel},
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@electronic{socialmedia.typepad.com,
   title       = {Social Media Research Blog: Ranking Nodes via Random Walks}, 
   url         = {http://socialmedia.typepad.com/blog/2008/09/ranking-nodes-via-random-walks.html},
   biburl      = {https://puma.uni-kassel.de/url/4ee3d85f5bf713eaa607f4fa25978b2d/hotho},
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