@inproceedings{SIGMOD-1997-GriffinH,
	author        = "Timothy Griffin and Richard Hull",
	booktitle     = "{Proceedings of the 27th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD97/P231.PDF",
	doi           = "10.1145/253260.253304",
	pages         = "231--242",
	publisher     = "{ACM Press}",
	title         = "{A Framework for Implementing Hypothetical Queries}",
	year          = 1997,
}