TY  - BOOK
AU  -  Ullman, Jeffrey D.
TI  - Principles of database systems
SN  - 9780273085942
U1  - 001.64 ULL 
PY  - 1983///] ©1982
CY  - Rockville, Md. 
PB  - : Computer Science Press
KW  - Database management
KW  - Query optimization
KW  - The relational model
KW  - Jeffrey D Ullman
KW  - Computer science
ER  -