@Inproceedings{jaeschke2009testing,
  author = {Jäschke, Robert and Eisterlehner, Folke and Hotho, Andreas and Stumme, Gerd},
  title  = {Testing and Evaluating Tag Recommenders in a Live System},

  year   = {2009},
  number = {},
  url    = {},

  const  = {\ text}
}
@Inproceedings{ames2007motivations,
  author = {Ames, Morgan and Naaman, Mor},
  title  = {Why we tag: motivations for annotation in mobile and online media},

  year   = {2007},
  number = {},
  url    = {http://doi.acm.org/10.1145/1240624.1240772},
  doi = {10.1145/1240624.1240772},
  const  = {\ text}
}