Huang, T.-H., Lasecki, W. and Bigham, J. 2015. Guardian: A Crowd-Powered Spoken Dialog System for Web APIs. Proceedings of the AAAI Conference on Human Computation and Crowdsourcing. 3, 1 (Sep. 2015), 62-71. DOI:https://doi.org/10.1609/hcomp.v3i1.13237.