@inproceedings{VLDB-1980-Honeyman,
	author        = "Peter Honeyman",
	booktitle     = "{Proceedings of the Sixth International Conference on Very Large Data Bases}",
	cdrom         = "VLDB80/P239.PDF",
	pages         = "239--244",
	publisher     = "{IEEE Computer Society}",
	title         = "{Extension Joins}",
	year          = 1980,
}