@article{SLC_1989_21_a12,
     author = {Pierre Bouchard and Mario Ouellette},
     title = {D\'ecomposition arborescente de {Mario} {Ouellette}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1989},
     volume = {21},
     url = {http://geodesic.mathdoc.fr/item/SLC_1989_21_a12/}
}