TY  - BOOK
AU  - Rival Ivan Ed.
ED  - NATO advanced study institute on ordered sets (1981 : Banff)
TI  - Proceeding on ordered sets(Banff)1981
T2  - NATO advanced study institute series C, mathematical and physical sciences; 83
U1  - B217p1,N81, M2 
PY  - 1982///
CY  - Dordrecht
PB  - D Reidel Publishing company      
KW  - Combinatorial theory
ER  -