TY  - BOOK
AU  - Book,Ronald V.
ED  - Simposium on Formal Language Theory
TI  - Formal lenguage theory: perspectives and open problems
SN  - 0121153509
U1  - 511.3 
PY  - 1980///
CY  - New York
PB  - London : Academic Press
KW  - LENGUAJES FORMALES
ER  -