@inproceedings{LICS-1987-GaifmanMSV,
	author        = "Haim Gaifman and Harry G. Mairson and Yehoshua Sagiv and Moshe Y. Vardi",
	booktitle     = "{Proceedings of the Second Symposium on Logic in Computer Science}",
	pages         = "106--115",
	publisher     = "{IEEE Computer Society}",
	title         = "{Undecidable Optimization Problems for Database Logic Programs}",
	year          = 1987,
}