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@article{DCG_1987__2_131030, author = {G.T. Sallee}, title = {Invertible {Relations} on {Polytopes.}}, journal = {Discrete & computational geometry}, pages = {395--400}, publisher = {mathdoc}, volume = {2}, year = {1987}, zbl = {0629.52013}, url = {http://geodesic.mathdoc.fr/item/DCG_1987__2_131030/} }
G.T. Sallee. Invertible Relations on Polytopes.. Discrete & computational geometry, Tome 2 (1987), pp. 395-400. http://geodesic.mathdoc.fr/item/DCG_1987__2_131030/