@inproceedings{HT-1991-HaraKW,
	author        = "Yoshinori Hara and Arthur M. Keller and Gio Wiederhold",
	booktitle     = "{Proceedings of the Third Conference on Hypertext}",
	cdrom         = "HT1991/P075.pdf",
	doi           = "10.1145/122974.122982",
	isbn          = "0-89791-461-9",
	pages         = "75--90",
	publisher     = "{ACM}",
	title         = "{Implementing Hypertext Database Relationships through Aggregations and Exceptions}",
	year          = 1991,
}