@inproceedings{CHI-1999-UnderkofflerI,
	author        = "John Underkoffler and Hiroshi Ishii",
	booktitle     = "{Proceedings of the 17th ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/302979.303114",
	isbn          = "0-201-48559-1",
	pages         = "386--393",
	publisher     = "{ACM}",
	title         = "{Urp: A Luminous-Tangible Workbench for Urban Planning and Design}",
	year          = 1999,
}