@article{tapos98:fisher+,
	address={New York, NY, USA},
	author={Fisher, Kathleen and Mitchell, John C.},
	journal={Theory and Practice of Object Systems},
	number=1,
	pages={3--25},
	publisher={John Wiley \& Sons, Inc.},
	title={On the relationship between classes, objects, and data abstraction},
	volume=4,
	year=1998,
}