@inproceedings{HT-1991-BotafogoS,
	author        = "Rodrigo A. Botafogo and Ben Shneiderman",
	booktitle     = "{Proceedings of the Third Conference on Hypertext}",
	cdrom         = "HT1991/P063.pdf",
	doi           = "10.1145/122974.122981",
	isbn          = "0-89791-461-9",
	pages         = "63--74",
	publisher     = "{ACM}",
	title         = "{Identifying Aggregates in Hypertext Structures}",
	year          = 1991,
}