@inproceedings{SIGMOD-1983-Zaniolo,
	author        = "Carlo Zaniolo",
	booktitle     = "{Proceedings of the 13th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD83/P207.PDF",
	doi           = "10.1145/582192.582226",
	pages         = "207--218",
	publisher     = "{ACM Press}",
	title         = "{The Database Language GEM}",
	year          = 1983,
}