@inproceedings{SIGMOD-1980-Sakai,
	author        = "Hirotaka Sakai",
	booktitle     = "{Proceedings of the 10th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD80/P001.PDF",
	doi           = "10.1145/582250.582252",
	pages         = "1--8",
	publisher     = "{ACM Press}",
	title         = "{Entity-Relationship Approach to the Conceptual Schema Design}",
	year          = 1980,
}