TY  - BOOK
AU  - Ullman Jeffrey D
TI  - Principles of database systems
U1  - 001.64 
PY  - 2003///
CY  - New Delhi
PB  - Galgotia Publications (P) Ltd
KW  - The Hierarchical model
KW  - The Network model and the DBTG Proposal
KW  - Physical data organization
N1  - Index
ER  -