1. ANSI/X3/SPARC, Study Group on Data Base Management Systems, “Interim Report 75–02-08”, ACM SIGMOD Newsletter, FDT, Vol. 7, No. 2, 1975
2. “A Comparative Analysis of Methodologies for Database Schema Integration”;Batini;ACM Computing Surveys,1986
3. “On Conceptual Modelling”,1984
4. “Bestuurlijke Informatiesystemen en Automatisering”;Bemelmans,1987
5. E.O. de Brock, “Database Models and Retrieval Languages”, Proef-schrift, Technische Hogeschool Eindhoven 16 maart, 1984