TY  - BOOK
AU  - Hughes G E
AU  - Cresswell M J 
TI  - A new introduction to modal logic
SN  - 9780415126007
U1  - 160 
PY  - 1996///
CY  - London
PB  - Routledge
KW  - Modal Logic
KW  - Logic Philosophy
KW  - Philosophy
ER  -