@inproceedings{ADL-1997-LimN,
	author        = "Ee-Peng Lim and Wee Keong Ng",
	booktitle     = "{Proceedings of the Fourth International Forum on Research and Technology Advances in Digital Libraries}",
	doi           = "10.1109/ADL.1997.601208",
	isbn          = "0-8186-8010-5",
	pages         = "128--139",
	publisher     = "{IEEE Computer Society}",
	title         = "{A Relational Interface for Heterogeneous Information Sources}",
	year          = 1997,
}