@inproceedings{CHI-2009-PiperH,
	author        = "Anne Marie Piper and James D. Hollan",
	booktitle     = "{Proceedings of the 27th ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/1518701.1518885",
	isbn          = "978-1-60558-246-7",
	pages         = "1227--1236",
	publisher     = "{ACM}",
	title         = "{Tabletop displays for small group study: affordances of paper and digital materials}",
	year          = 2009,
}