TY  - BOOK
AU  - Frege, Gottlob
AU  - Furth, Montgomery
TI  - The basic laws of arithmetic: exposition of the system 
AV  - BC 135 F7
PY  - 1964///
CY  - Berkeley, Calif.
PB  - University of California
KW  - Lógica simbólica y matemática
ER  -