@inproceedings{HCI-SEC-1997-Purchase,
	author        = "Helen C. Purchase",
	booktitle     = "{Proceedings of the Seventh International Conference on Human-Computer Interaction. Volume 2: Social and Ergonomic Considerations}",
	isbn          = "0-444-82183-X",
	pages         = "687--690",
	publisher     = "{Elsevier}",
	title         = "{Multimedia Communication and Technology: A Semiotic Perspective}",
	year          = 1997,
}