The Axiomatization of Affine Oriented Matroids Reassessed
  In an unpublished manuscript of 1992, Johan Karlander has given an axiomatization of affine oriented matroids. A closer examination of the text revealed an invalid construction and an incorrect argument in the proof of his main theorem. This paper provides an alternative argument to fix and slightly simplify the proof of the main theorem. 
Andrea Baum and Yida Zhu
math.CO