@inproceedings{PODS-1996-BenediktDLW,
	author        = "Michael Benedikt and Guozhu Dong and Leonid Libkin and Limsoon Wong",
	booktitle     = "{Proceedings of the 15th Symposium on Principles of Database Systems}",
	doi           = "10.1145/237661.237667",
	isbn          = "0-89791-781-2",
	pages         = "5--16",
	publisher     = "{ACM Press}",
	title         = "{Relational Expressive Power of Constraint Query Languages}",
	year          = 1996,
}