@electronic{tagora.ecs.soton.ac.uk,
   title       = {TAGora Sense Repository}, 
   url         = {http://tagora.ecs.soton.ac.uk/tsr/},
   biburl      = {https://puma.uni-kassel.de/url/f307d547246fc03a34298ef6f2d31655/hotho},
   keywords    = {filtering matching sense tagora},
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@electronic{jamesthornton.com,
   title       = {Collaborative Filtering Research Papers}, 
   url         = {http://jamesthornton.com/cf/},
   biburl      = {https://puma.uni-kassel.de/url/bb09247d51d0f760500275ac66344d03/hotho},
   keywords    = {collaborative filtering overview recommender research},
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@electronic{www.informatik.uni-freiburg.de,
   title       = {Computer-based New Media, Institute for Computer Science, University of Freiburg}, 
   url         = {http://www.informatik.uni-freiburg.de/cgnm/lehre/rs-04s/references_en.html},
   biburl      = {https://puma.uni-kassel.de/url/11118f36e4267909a5225ce98ca982d4/hotho},
   keywords    = {recommender überblick literatur ir site filtering lars overview seminar2006 intelligent},
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