Hadano, M., M. Nakatsuji, H. Toda, and Y. Koike. “Assigning Tasks to Workers by Referring to Their Schedules in Mobile Crowdsourcing”. Proceedings of the AAAI Conference on Human Computation and Crowdsourcing, vol. 3, no. 1, Sept. 2015, pp. 10-11, doi:10.1609/hcomp.v3i1.13254.