@inproceedings{SIGMOD-1990-WidomF,
	author        = "Jennifer Widom and Sheldon J. Finkelstein",
	booktitle     = "{Proceedings of the 20th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD90/P259.PDF",
	doi           = "10.1145/93597.98735",
	pages         = "259--270",
	title         = "{Set-Oriented Production Rules in Relational Database Systems}",
	year          = 1990,
}