@inproceedings{SIGMOD-1976-SeveranceL,
	author        = "Dennis G. Severance and Guy M. Lohman",
	booktitle     = "{Proceedings of the Sixth ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD76/P043.PDF",
	doi           = "10.1145/509383.509391",
	pages         = "43",
	publisher     = "{ACM}",
	title         = "{Differential Files: Their Application to the Maintenance of Large Data Bases}",
	year          = 1976,
}