@inproceedings{SIGMOD-1984-Hall,
	author        = "Patrick A. V. Hall",
	booktitle     = "{Proceedings of the 14th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD84/P326.PDF",
	doi           = "10.1145/602259.602301",
	pages         = "326--333",
	publisher     = "{ACM Press}",
	title         = "{Relational Algebras, Logic, and Functional Programming}",
	year          = 1984,
}