Peter P. Chen (Ed.):
Entity-Relationship Approach to Information Modeling and Analysis, Proceedings of the Second International Conference on the Entity-Relationship Approach (ER'81), Washington, DC, USA, October 12-14, 1981.
North-Holland 1983, ISBN 0-444-86747-3
Ramez Elmasri, Gio Wiederhold: GORDAS: A Formal High-Level Query Language for the Entity-Relationship Model.
49-72
Integrity and Completeness
Yves Tabourier, Dominique Nanci: The Occurrence Structure Concept: An Approach to Structural Integrity Constraints in the Entity-Relationship Model, with Application to Realationship Decomposition and Metamodel Achievement.
73-108
Paolo Atzeni, Peter P. Chen: Completeness of Query Languages for the Entity-Relationship Model.
109-122