@inproceedings{SIGIR-1973-ClarkS,
	author        = "W. O. Clark and L. L. Shannon",
	booktitle     = "{Proceedings of the ACM SIGIR meeting on Programming Languages and Information Retrieval}",
	pages         = "131--143",
	publisher     = "{ACM}",
	title         = "{A Dual Structured Data Base System}",
	year          = 1973,
}