TY  - BOOK
AU  - Ullman, Jeffrey D., ed.
TI  - Principles of database and knowledge-base systems; v.1 & 2
T2  - Principles of computer science series
SN  - 0716781581
U1  - 005.74 
PY  - 1988///
CY  - Maryland
PB  - Comp. Sci. Press
ER  -