@inproceedings{PODS-1995-Papadimitriou,
	author        = "Christos H. Papadimitriou",
	booktitle     = "{Proceedings of the 14th Symposium on Principles of Database Systems}",
	doi           = "10.1145/212433.212436",
	isbn          = "0-89791-730-8",
	pages         = "1--10",
	publisher     = "{ACM Press}",
	title         = "{Database Metatheory: Asking the Big Queries}",
	year          = 1995,
}