@inproceedings{TOOLS-PACIFIC-1993-Duke93a,
	author        = "Roger Duke",
	booktitle     = "{Proceedings of the 12th International Conference on Technology of Object-Oriented Languages and Systems}",
	isbn          = "0-13-124512-0",
	pages         = "449--461",
	publisher     = "{Prentice Hall}",
	title         = "{Class Operators for Object Compatibility}",
	year          = 1993,
}