@article{SLC_1991_26_a7,
     author = {Henning Krause},
     title = {Endomorphisms of {Words} in a {Quiver}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1991},
     volume = {26},
     url = {http://geodesic.mathdoc.fr/item/SLC_1991_26_a7/}
}