TY  - BOOK
AU  - Etchemendy,John
TI  - The concept of logical consequence / 
SN  - 0-674-15642-0
PY  - 1990///
CY  - Harvard : 
PB  - University Press, 
KW  - LÃ³gica matemÃ¡tica
KW  - embne
ER  -