@article{DCG_1993__10_2_131276,
     author = {J. Richter-Gebert and N.E. Mn\"ev},
     title = {Two {Constructions} of {Oriented} {Matroids} with {Disconnected} {Extension} {Space.}},
     journal = {Discrete & computational geometry},
     pages = {271--286},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1993},
     zbl = {0789.05021},
     url = {http://geodesic.mathdoc.fr/item/DCG_1993__10_2_131276/}
}