TY  - BOOK
AU  - Grahne,G.
TI  - The problem of incomplete information in relational databases
SN  - 3540549196
AV  - Q335 G83
PY  - 1991///
CY  - Berlin
PB  - Springer-Verlag
KW  - Reasoning
KW  - Logic, Symbolic and mathematical
KW  - Artificial intelligence
ER  -