%0 Journal Article
%A B. Sturmfels
%A G. M. Ziegler
%T Extension Spaces of Oriented Matroids.
%J Discrete & computational geometry
%D 1993
%P 23-46
%V 10
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DCG_1993__10_2_131258/
%F DCG_1993__10_2_131258