@inproceedings{SAC-1993-HurschLM,
	author        = "Walter L. Hürsch and Karl J. Lieberherr and Sougata Mukherjea",
	booktitle     = "{Proceedings of the Eighth Symposium on Applied Computing: States of the Art and Practice}",
	doi           = "10.1145/162754.162807",
	pages         = "54--62",
	publisher     = "{ACM Press}",
	title         = "{Object-Oriented Schema Extension and Abstraction}",
	year          = 1993,
}