@inproceedings{SIGMOD-1977-Scheuermann,
	author        = "Peter Scheuermann",
	booktitle     = "{Proceedings of the Seventh ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD77/P144.PDF",
	doi           = "10.1145/509404.509427",
	pages         = "144--156",
	publisher     = "{ACM}",
	title         = "{Concepts of a Data Base Simulation Language}",
	year          = 1977,
}