TY  - BOOK
AU  - Vossen Gottfried
TI  - Data models database languages and database management systems
T2  - International computer science series
U1  - D65,8(B):3, N1 
PY  - 1991///
CY  - England
PB  - Addsion-Wesley Publishing        
KW  -  Database
KW  - Computer science
ER  -