@article {3889,
	title = {An Axiomatic Model of Dynamic Schema Evolution in Objectbase Systems},
	journal = {ACM Transactions on Database Systems (TODS)},
	volume = {22},
	year = {1997},
	pages = {75--114},
	doi = {10.1145/244810.244813},
	author = {Randal J. Peters and Tamer Ozsu}
}
