TY  - BOOK
AU  - Encyclopedia of Mathematics and its applications
AU  - Bjorner, A.
TI  - Oriented matroids
T2  - Encyclopedia of Mathematics and its applications
U1  - 510.3 
PY  - 1999///
CY  - Cambridge
PB  - Cambridge University Press
N1  - "Purchased under NBHM grant for the year 1999-2000"
ER  -