TY  - BOOK
AU  - Bachem, Achim.
AU  - Kern, Walter.
TI  - Linear programming duality: an introduction to oriented matroids
T2  - Universitext
SN  - 3540554173
U1  - 511.6 
PY  - 1992///
CY  - Berlin
PB  - Springer-Verlag
ER  -