@inproceedings{scoringworkersincrowdsourcinghowmany,
  title = {Scoring Workers in Crowdsourcing: How Many Control Questions are Enough?},
  author = {Qiang Liu and Alexander T. Ihler and Mark Steyvers},
  year = {2013},
  booktitle = {NeurIPS 2013 12},
  url = {http://papers.nips.cc/paper/4889-scoring-workers-in-crowdsourcing-how-many-control-questions-are-enough},
}