@inproceedings{LICS-1989-AbiteboulV,
	author        = "Serge Abiteboul and Victor Vianu",
	booktitle     = "{Proceedings of the Fourth Annual Symposium on Logic in Computer Science}",
	doi           = "10.1109/LICS.1989.39160",
	isbn          = "0-8186-1954-6",
	pages         = "71--79",
	publisher     = "{IEEE Computer Society}",
	title         = "{Fixpoint Extensions of First-Order Logic and Datalog-Like Languages}",
	year          = 1989,
}