@inproceedings{FDG-2011-WengSM,
	author        = "Lilian Weng and Rossano Schifanella and Filippo Menczer",
	booktitle     = "{Proceedings of the Sixth Conference on the Foundations of Digital Games}",
	doi           = "10.1145/2159365.2159417",
	isbn          = "978-1-4503-0804-5",
	pages         = "295--297",
	publisher     = "{ACM}",
	title         = "{The chain model for social tagging game design}",
	year          = 2011,
}