… A data model, called the entity-relationship model, is proposed. This model …, and data manipulation are discussed. The entity-relationship model can be used …, the relational model, and the entity set model. Semantic ambiguities in these models …
TODS, 1(1):9-36, 1976. [doi]… evolution through changes to the Entity-Relationship (ER) schema of a database. We …, an Evolutionary ER diagram for specifying the derivation relationships between schema versions, relationships among attributes, and the conditions for maintaining …
er 1994: 132-151 [doi]