@inproceedings{CHI-2015-KimN,
	author        = "Chang-Min Kim and Tek-Jin Nam",
	booktitle     = "{Proceedings of the 33rd ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/2702123.2702444",
	isbn          = "978-1-4503-3145-6",
	pages         = "4161--4164",
	publisher     = "{ACM}",
	title         = "{G-raff: An Elevating Tangible Block for Spatial Tabletop Interaction}",
	year          = 2015,
}