TY  - BOOK
AU  - Ullman, Jeffrey D.
TI  - Principles of database systems
SN  - 0-273-085948
U1  - 005.74 
PY  - 1982///
CY  - London
PB  - Pitman
KW  - Computer science
KW  - DBTG
KW  - Design theory
KW  - Query
N1  - Includes bibliographical references and index; na
ER  -