@inproceedings{SIGMOD-1982-Longstaff,
	author        = "J. Longstaff",
	booktitle     = "{Proceedings of the 12th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD82/P111.PDF",
	doi           = "10.1145/582353.582371",
	pages         = "111--117",
	publisher     = "{ACM Press}",
	title         = "{ERQ: Controlled Inference and Instruction Techniques for DBMS Query Languages}",
	year          = 1982,
}