@inproceedings{SIGMOD-1987-CroftS,
	author        = "W. Bruce Croft and David W. Stemple",
	booktitle     = "{Proceedings of the 17th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD87/P504.PDF",
	doi           = "10.1145/38713.38764",
	pages         = "504--509",
	title         = "{Supporting Offics Document Architectures with Constrained Types}",
	year          = 1987,
}