@inproceedings{SIGMOD-1987-McKenzieS,
	author        = "L. Edwin McKenzie and Richard T. Snodgrass",
	booktitle     = "{Proceedings of the 17th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD87/P467.PDF",
	doi           = "10.1145/38713.38761",
	pages         = "467--478",
	title         = "{Extending the Relational Algebra to Support Transaction Time}",
	year          = 1987,
}