@inproceedings{CHI-PLAY-2015-HarmsSWKG,
	author        = "Johannes Harms and Dominik Seitz and Christoph Wimmer and Karin Kappel and Thomas Grechenig",
	booktitle     = "{Proceedings of the Second Annual Symposium on Computer-Human Interaction in Play}",
	doi           = "10.1145/2793107.2793146",
	isbn          = "978-1-4503-3466-2",
	pages         = "109--113",
	publisher     = "{ACM}",
	title         = "{Low-Cost Gamification of Online Surveys: Improving the User Experience through Achievement Badges}",
	year          = 2015,
}