TY  - BOOK
AU  - Das,Ramaprasad
TI  - Logic of truth functions: an introduction to symbolic logic 
U1  - 164 
PY  - 1964///
CY  - Calcutta
PB  - Firma KLM
KW  - Logic, Symbolic mathematical
KW  - Truth-functions
N1  - Includes index
ER  -