TY  - BOOK
AU  - Ullman,Jeffrey D.
AU  - Database systems
TI  - Principles of databaseand knowledge- base systems
SN  - 9780716781585
AV  - QA76.9.D3 U44
PY  - 1988///
CY  - Potomac, Md.
PB  - Computer Science Press
KW  - Database management
N1  - Includes index
ER  -