TY  - BOOK
AU  - Whitehead,Alfred North
AU  - Russell,Bertrand
TI  - Principia mathematica: to *56 
PY  - 1970///
CY  - New York
PB  - Cambridge University Press
KW  - LOGICA MATEMATICA
KW  - LEMB
KW  - LOGICA
KW  - MATEMATICA LOGICA
ER  -