TY  - BOOK
AU  - Ackermann Robert
TI  - Introduction to many valued logics
T2  - Monographs in modern logic ed by G B Keene
U1  - R1, K71 (ER) 
PY  - 1967///
CY  - London
PB  - Routledge and Kegan Paul    
KW  - LOGIC
ER  -