TY  - BOOK
AU  - Whitehead,Alfred North
AU  - Whitehead,Alfred North
AU  - Russell,Bertrand
TI  - Principia mathematica. V 3.- 2nd ed
PY  - 1927///
CY  - Cambridge
PB  - University Press
KW  - Mathematics
KW  - Philosophy
KW  - Logic, Symbolic and mathematical
ER  -