@article{SLC_1995_35_a0,
     author = {Bruce Sagan},
     title = {Why the {Characteristic} {Polynomial} {Factors}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {35},
     year = {1995},
     url = {http://geodesic.mathdoc.fr/item/SLC_1995_35_a0/}
}