Geodesic
Algebraic and topological invariants of oriented matroids
Doklady Akademii Nauk, Tome 307 (1989) no. 4, pp. 791-795.

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     author = {I. M. Gel'fand and G. L. Rybnikov},
     title = {Algebraic and topological invariants of oriented matroids},
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     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_307_4_a4/}
}
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I. M. Gel'fand; G. L. Rybnikov. Algebraic and topological invariants of oriented matroids. Doklady Akademii Nauk, Tome 307 (1989) no. 4, pp. 791-795. http://geodesic.mathdoc.fr/item/DAN_1989_307_4_a4/