@inproceedings{HT-ECHT-1992-BraHK,
	author        = "Paul De Bra and Geert-Jan Houben and Yoram Kornatzky",
	booktitle     = "{Proceedings of the European Conference on Hypertext Technology}",
	cdrom         = "ECHT1992/P222.pdf",
	doi           = "10.1145/168466.168530",
	isbn          = "0-89791-547-X",
	pages         = "222--231",
	publisher     = "{ACM}",
	title         = "{An Extensible Data Model for Hyperdocuments}",
	year          = 1992,
}