@article{DOCMA_1996__1__a13, author = {Richter-Gebert, J\"urgen}, title = {Two interesting oriented matroids}, journal = {Documenta mathematica}, pages = {137--148}, publisher = {mathdoc}, volume = {1}, year = {1996}, language = {en}, url = {http://geodesic.mathdoc.fr/item/DOCMA_1996__1__a13/} }