@inproceedings{SIGMOD-1980-ChangLD,
	author        = "Chin-Chen Chang and Richard C. T. Lee and David Hung-Chang Du",
	booktitle     = "{Proceedings of the 10th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD80/P157.PDF",
	doi           = "10.1145/582250.582276",
	pages         = "157--168",
	publisher     = "{ACM Press}",
	title         = "{Some Properties of Cartesian Product Files}",
	year          = 1980,
}