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@article{DCG_1987__2_131005, author = {J. Kahn}, title = {On {Lattices} with {M\"obius} {Function} \ensuremath{\pm}1, 0.}, journal = {Discrete & computational geometry}, pages = {1--8}, publisher = {mathdoc}, volume = {2}, year = {1987}, url = {http://geodesic.mathdoc.fr/item/DCG_1987__2_131005/} }
J. Kahn. On Lattices with Möbius Function ±1, 0.. Discrete & computational geometry, Tome 2 (1987), pp. 1-8. http://geodesic.mathdoc.fr/item/DCG_1987__2_131005/