TY  - BOOK
AU  - Gyssens M
ED  - International Conference on Database theory( 1988 : Belgium )
ED  - International Conference on Database theory
TI  - ICDT : proceedings
U1  - 5.74 
PY  - 1988///
CY  - Berlin
PB  - Springer Verlag
KW  - Data base theory
ER  -