TY  - BOOK
AU  - Segerberg,Krister
TI  - Classical propositional operators: an exercise in the foundations of logic 
T2  - Oxford logic guides (Clarendon Press, Oxford)
SN  - 0-19-853173-7
U1  - 511.3 21E
PY  - 1982///
CY  - Oxford
PB  - Clarendon Press
ER  -