TY  - BOOK
AU  - Date,C.J.
AU  - Darwen,Hugh
TI  - Relational database: writings, 1989-1991 
SN  - 0201543036 :
U1  - 005.756 
PY  - 1992///
CY  - Reading, Mass.
PB  - Addison-Wesley
KW  - Relational databases
N1  - Includes bibliographical references and index
ER  -