@article{SLC_1987_17_a2,
     author = {Gilbert Labelle},
     title = {D\'eriv\'ees directionnelles et d\'eveloppements de {Taylor} combinatoires},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1987},
     volume = {17},
     url = {http://geodesic.mathdoc.fr/item/SLC_1987_17_a2/}
}