@inproceedings{VLDB-1975-Tsichritzis,
	author        = "Dennis Tsichritzis",
	booktitle     = "{Proceedings of the First International Conference on Very Large Data Bases}",
	cdrom         = "VLDB75/P532.PDF",
	doi           = "10.1145/1282480.1282538",
	pages         = "532--534",
	publisher     = "{ACM}",
	title         = "{Features of a Conceptual Schema}",
	year          = 1975,
}