@inproceedings{SIGFIDET-1971-Heath,
	author        = "I. J. Heath",
	booktitle     = "{Proceedings of the Second ACM-SIGFIDET Workshop on Data Description, Access and Control}",
	cdrom         = "SIGFIDET71/P019.pdf",
	pages         = "19--33",
	publisher     = "{ACM}",
	title         = "{Unacceptable File Operations in a Relational Data Base}",
	year          = 1971,
}