TY  - BOOK
AU  - Ullman Jeffrey D
TI  - Principles of database systems
U1  - D65,8(B):3, M02;M4  TD 
PY  - 1988///
CY  - New Delhi    
PB  -  Galgotia Publications Pvt. Ltd.     
KW  - Database systems
N1  - Bibliography 451-473p
ER  -