@Article{liu2012crowdsourcing,
  author = {Liu, Xuan and Lu, Meiyu and Ooi, Beng Chin and Shen, Yanyan and Wu, Sai and Zhang, Meihui},
  title  = {CDAS: a crowdsourcing data analytics system},
  journal = {Proceedings of the VLDB Endowment},
  year   = {2012},
  number = {10},
  url    = {http://dl.acm.org/citation.cfm?id=2336664.2336676},

  const  = {\ text}
}