@inproceedings{STOC-1982-Vardi,
	author        = "Moshe Y. Vardi",
	booktitle     = "{Proceedings of the 14th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800070.802186",
	isbn          = "0-89791-067-2",
	pages         = "137--146",
	publisher     = "{ACM}",
	title         = "{The Complexity of Relational Query Languages}",
	year          = 1982,
}