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  year   = {2013},
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  url    = {http://doi.acm.org/10.1145/2507157.2507222},
  doi = {10.1145/2507157.2507222},
  const  = {\ text}
}
@Inproceedings{doerfel2013analysis,
  author = {Doerfel, Stephan and Jäschke, Robert},
  title  = {An analysis of tag-recommender evaluation procedures},

  year   = {2013},
  number = {},
  url    = {https://www.kde.cs.uni-kassel.de/pub/pdf/doerfel2013analysis.pdf},
  doi = {10.1145/2507157.2507222},
  const  = {\ text}
}
@Article{journals/insk/KrauseLHRS12,
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  year   = {2012},
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  url    = {http://dblp.uni-trier.de/db/journals/insk/insk35.html#KrauseLHRS12},

  const  = {\ text}
}
@Article{benz2010social,
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  doi = {10.1007/s00778-010-0208-4},
  const  = {\ text}
}
@Inproceedings{koerner2010thinking,
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  year   = {2010},
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  url    = {http://www.kde.cs.uni-kassel.de/benz/papers/2010/koerner2010thinking.pdf},

  const  = {\ text}
}