@inproceedings{VLDB-1990-TuzhilinC,
	author        = "Alexander Tuzhilin and James Clifford",
	booktitle     = "{Proceedings of the 16th International Conference on Very Large Data Bases}",
	ee            = "http://www.vldb.org/conf/1990/P013.PDF",
	isbn          = "1-55860-149-X",
	pages         = "13--23",
	publisher     = "{Morgan Kaufmann}",
	title         = "{A Temporal Relational Algebra as Basis for Temporal Relational Completeness}",
	year          = 1990,
}