@inproceedings{SIGMOD-1983-DAtriMS,
	author        = "Alessandro D'Atri and Marina Moscarini and Nicolas Spyratos",
	booktitle     = "{Proceedings of the 13th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD83/P173.PDF",
	doi           = "10.1145/582192.582221",
	pages         = "173--177",
	publisher     = "{ACM Press}",
	title         = "{Answering Queries in Relational Databases}",
	year          = 1983,
}