@inproceedings{SIGMOD-1977-SorensonW,
	author        = "Paul G. Sorenson and Joseph A. Wald",
	booktitle     = "{Proceedings of the Seventh ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD77/P030.PDF",
	doi           = "10.1145/509404.509411",
	pages         = "30--39",
	publisher     = "{ACM}",
	title         = "{PICASSO — An Aid to an End-User Facility}",
	year          = 1977,
}