@article{SLC_1983_09_a3,
     author = {Luigi Cerlienco and Francesco Piras},
     title = {Coalgebre graduate e sequenze di {Goldman-Rota}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1983},
     volume = {09},
     url = {http://geodesic.mathdoc.fr/item/SLC_1983_09_a3/}
}