TY  - BOOK
AU  - Codd E F..
TI  - The relational model for database management,  version 2:  : version 2
SN  - 0201141922
PY  - 1991///
CY  - Reading, Massachusetts
PB  -  : Addison-Wesley
KW  - BASE DE DATOS
KW  - GESTION DE BASES DE DATOS
KW  - MODELO RELACIONAL
ER  -