@inproceedings{HCI-SHI-1993-BenfordF,
	author        = "Steve Benford and Lennart E. Fahlén",
	booktitle     = "{Proceedings of the Fifth International Conference on Human-Computer Interaction. Volume 2: Software and Hardware Interfaces}",
	isbn          = "0-444-89540-X",
	pages         = "693--698",
	publisher     = "{Elsevier}",
	title         = "{Awareness, Focus, and Aura: A Spatial Model of Interaction in Virtual Worlds}",
	year          = 1993,
}