@article{SLC_1984_11_a8,
     author = {Luigi Cerlienco and Giorgio Nicoletti and Francesco Piras},
     title = {Umbral {Calculus}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1984},
     volume = {11},
     url = {http://geodesic.mathdoc.fr/item/SLC_1984_11_a8/}
}