@article{infcomp02:fisher+,
	address={Duluth, MN, USA},
	author={Fisher, Kathleen and Reppy, John},
	journal={Inf. Comput.},
	number=1,
	pages={28--55},
	publisher={Academic Press, Inc.},
	title={Inheritance-based subtyping},
	volume=177,
	year=2002,
}