@inproceedings{PODS-1987-GelderT,
	author        = "Allen Van Gelder and Rodney W. Topor",
	booktitle     = "{Proceedings of the Sixth Symposium on Principles of Database Systems}",
	cdrom         = "['journals/anthology/cd1-3:PODS87/P313.PDF', 'journals/anthology/dvd1:text/1-3/PODS87/P313.PDF']",
	doi           = "10.1145/28659.28693",
	isbn          = "0-89791-223-3",
	pages         = "313--327",
	publisher     = "{ACM}",
	title         = "{Safety and Correct Translation of Relational Calculus Formulas}",
	year          = 1987,
}