@inproceedings{SIGMOD-1976-WelchG,
	author        = "James W. Welch and J. Wesley Graham",
	booktitle     = "{Proceedings of the Sixth ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD76/P021.PDF",
	doi           = "10.1145/509383.509387",
	pages         = "21--29",
	publisher     = "{ACM}",
	title         = "{Retrieval Using Ordered Lists in Inverted and Multilist Files}",
	year          = 1976,
}