1. Report on database management system;ANSI/X 3/SPARC;Final Report,1977
2. Centralized versus decentralized Hospital Information Systems;Bakker,1977
3. A medical Information System and Data Language for ambulatory practices;Beaman;Computer,1979
4. A sophisticated introduction to data base normalization theory;Beeri,1978
5. A relational model for large shared data banks;Codd;Commun. A.C.M.,1970