TY  - BOOK
AU  - ARMSTRONG,D.M.
TI  - A COMBINATIONRAL THEORY OF POSSIBILITY / 
U1  - 146.5 
PY  - 1989///
CY  - [S.N] : 
PB  - CAMBRIBGE UNIVERSITY PRESS ، 
KW  - LOGIC
KW  - PHILOSOPHY - THEORY
ER  -