@article {3901,
	title = {Queries and Query Processing in Object-Oriented Database Systems},
	journal = {ACM Transactions on Information Systems (TOIS)},
	volume = {8},
	year = {1990},
	pages = {387--430},
	doi = {10.1145/102675.102678},
	author = {Dave D. Straube and Tamer Ozsu}
}
