@inproceedings{FDG-2014-Back,
	author        = "Jon Back",
	booktitle     = "{Proceedings of the Ninth International Conference on the Foundations of Digital Games}",
	ee            = "http://www.fdg2014.org/papers/fdg2014_wip_02.pdf",
	isbn          = "978-0-9913982-2-5",
	publisher     = "{Society for the Advancement of the Science of Digital Games}",
	title         = "{'Knock Once for Yes' - Knocking as feedback in the location-based game passing on}",
	year          = 2014,
}