KhudaBukhsh, Ashiqur, Jaime Carbonell, and Peter Jansen. 2014. “Detecting Non-Adversarial Collusion in Crowdsourcing”. Proceedings of the AAAI Conference on Human Computation and Crowdsourcing 2 (1):104-11. https://doi.org/10.1609/hcomp.v2i1.13157.