1. The entity-relationship model — toward a unified view of data;Chen;ACM Tans Database Syst,1976
2. Conceptual schema and relational database design;Nijssen,1989
3. ISO 10303-1. Industrial automation systems and integration — product data representation and exchange. Part 1: Overview and fundamental principles. ISO, Geneve, 1994.
4. ISO 10303-11. Industrial automation systems and integration — product data representation and exchange. Part 11: Description methods: The EXPRESS language reference manual. ISO, Geneve, 1994.
5. FIPS Publication 184 — Integration Definition for Information Modeling (IDEF1X), National Institute of Standard and Technology. Gaithersburg, 1993.