@inproceedings{CHI-2009-HackerA,
	author        = "Severin Hacker and Luis von Ahn",
	booktitle     = "{Proceedings of the 27th ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/1518701.1518882",
	isbn          = "978-1-60558-246-7",
	pages         = "1207--1216",
	publisher     = "{ACM}",
	title         = "{Matchin: eliciting user preferences with an online game}",
	year          = 2009,
}