@inproceedings{SIGMOD-1991-AhmedN,
	author        = "Rafi Ahmed and Shamkant B. Navathe",
	booktitle     = "{Proceedings of the 21st ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD91/P218.PDF",
	doi           = "10.1145/115790.115825",
	pages         = "218--227",
	title         = "{Version Management of Composite Objects in CAD Databases}",
	year          = 1991,
}