@book{1332,
	author = {ACM-SIGMOD International Conference on Management of Data and Lien, Y. Edmund, and Michigan.},
	title = {ACM - SIGMOD 1981 International Conference on Management of Data :},
	publisher = {ACM,},
	year = {1981},
	address = {New York :},
	note = {Papers presented at the 1981 ACM - Sigmod International Conference on Management of Data. Sponsored by the Special Interest Group for Management of Data of the Association for Computing Machinery}
}