@article{JAC_2007__25_2_a5,
     author = {Stembridge, John R.},
     title = {A short derivation of the {M\"obius} function for the {Bruhat} order.},
     journal = {Journal of Algebraic Combinatorics},
     pages = {141--148},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_2007__25_2_a5/}
}