@article{SLC_1983_09_a7,
     author = {Luigi Cerlienco and Giorgio Nicoletti and Francesco Piras},
     title = {Automorphisms of {Graded} {Coalgebras} and {Analogs} of the {Umbral} {Calculus}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {09},
     year = {1983},
     url = {http://geodesic.mathdoc.fr/item/SLC_1983_09_a7/}
}