@inproceedings{CHI-1991-Thiel,
	author        = "David D. Thiel",
	booktitle     = "{Proceedings of the Ninth ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/108844.109004",
	isbn          = "0-89791-383-3",
	pages         = "463--464",
	publisher     = "{ACM}",
	title         = "{The cue ball as part of a gestural interface}",
	year          = 1991,
}