@inproceedings{VLDB-1987-SernadasSE,
	author        = "Amílcar Sernadas and Cristina Sernadas and Hans-Dieter Ehrich",
	booktitle     = "{Proceedings of the 13th International Conference on Very Large Data Bases}",
	ee            = "http://www.vldb.org/conf/1987/P107.PDF",
	isbn          = "0-934613-46-X",
	pages         = "107--116",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Object-Oriented Specification of Databases: An Algebraic Approach}",
	year          = 1987,
}