TY  - BOOK
AU  - ACM
TI  - PROCEEDINGS OF THE 9TH ACM SIGACT-SIGMOD-SIGART SYMPOSIUM ON PRINCIPLES OF DATABASE SYSTEMS, NASHVIL
SN  - NCST
U1  - 774 
PY  - 1990///
CY  - NEW YORK
PB  - ACM
N1  - SC-10
ER  -