TY  - BOOK
AU  - Ackermann Robert
TI  - Nondeductive inference
T2  - monographs in modern logic ed by G B Keene
U1  - R14, K61 
PY  - 1966///
CY  - London
PB  - Routledge and Kegan Paul U. K.   
KW  - PHILOSOPHY
ER  -