@article{SLC_2003-2005_50_a2,
     author = {Vic Reiner and Dennis Stanton and Volkmar Welker},
     title = {The {Charney-Davis} {Quantity} {For} {Certain} {Graded} {Posets}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {50},
     year = {2003-2005},
     url = {http://geodesic.mathdoc.fr/item/SLC_2003-2005_50_a2/}
}