Bhattacharya, S., L. E. Celis, D. Chander, K. Dasgupta, S. Karanam, and V. Rajan. “Crowds of Crowds: Performance Based Modeling and Optimization over Multiple Crowdsourcing Platforms”. Human Computation, vol. 2, no. 1, Aug. 2015, doi:10.15346/hc.v2i1.6.