Nushi, Besmira, Adish Singla, Andreas Krause, and Donald Kossmann. 2016. “Learning and Feature Selection under Budget Constraints in Crowdsourcing”. Proceedings of the AAAI Conference on Human Computation and Crowdsourcing 4 (1):159-68. https://doi.org/10.1609/hcomp.v4i1.13278.