@inproceedings{SIGMOD-1989-EllisG,
	author        = "Clarence A. Ellis and Simon J. Gibbs",
	booktitle     = "{Proceedings of the 19th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD89/P399.PDF",
	doi           = "10.1145/67544.66963",
	pages         = "399--407",
	title         = "{Concurrency Control in Groupware Systems}",
	year          = 1989,
}