@inproceedings{SIGMOD-1991-ChenK,
	author        = "Qiming Chen and Yahiko Kambayashi",
	booktitle     = "{Proceedings of the 21st ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD91/P328.PDF",
	doi           = "10.1145/115790.115849",
	pages         = "328--337",
	title         = "{Nested Relation Based Database Knowledge Representation}",
	year          = 1991,
}