@inproceedings{VLDB-1977-Childs,
	author        = "D. L. Childs",
	booktitle     = "{Proceedings of the Third International Conference on Very Large Data Bases}",
	cdrom         = "VLDB77/P028.PDF",
	pages         = "28--46",
	publisher     = "{IEEE Computer Society}",
	title         = "{Extended Set Theory}",
	year          = 1977,
}