TY  - BOOK
AU  - Ullman,Jeffrey D.
TI  - Principles of database systems / 
U1  - 005 ULL  22nd ed. 
PY  - 1988///.
CY  - New Delhi : 
PB  - Galgotia Publications Private Limited, 
KW  - Computer science
KW  - Database systems
N1  - Includes index.
ER  -