@inproceedings{CHI-2009-KoikeNF,
	author        = "Hideki Koike and Wataru Nishikawa and Kentaro Fukuchi",
	booktitle     = "{Proceedings of the 27th ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/1518701.1518728",
	isbn          = "978-1-60558-246-7",
	pages         = "163--172",
	publisher     = "{ACM}",
	title         = "{Transparent 2-D markers on an LCD tabletop system}",
	year          = 2009,
}