@inproceedings{VLDB-1977-BachmanD,
	author        = "Charles W. Bachman and Manilal Daya",
	booktitle     = "{Proceedings of the Third International Conference on Very Large Data Bases}",
	cdrom         = "VLDB77/P464.PDF",
	pages         = "464--476",
	publisher     = "{IEEE Computer Society}",
	title         = "{The Role Concept in Data Models}",
	year          = 1977,
}