@inproceedings{CHI-2013-KhaledNB,
	author        = "Rilla Khaled and Mark J. Nelson and Pippin Barr",
	booktitle     = "{Proceedings of the 31st ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/2470654.2466201",
	isbn          = "978-1-4503-1899-0",
	pages         = "1509--1518",
	publisher     = "{ACM}",
	title         = "{Design metaphors for procedural content generation in games}",
	year          = 2013,
}