@inproceedings{SIGFIDET-1972-Stonebraker,
	author        = "Michael Stonebraker",
	booktitle     = "{Proceedings of the Third ACM-SIGFIDET Workshop on Data Description, Access and Control}",
	cdrom         = "SIGFIDET72/P243.pdf",
	pages         = "243--256",
	publisher     = "{ACM}",
	title         = "{Retrieval Efficiency Using Combined Indexes}",
	year          = 1972,
}