@article{GDZPPN001259474, title = {A characterization of Sheffer functions by hyperidentities.}, journal = {Semigroup forum}, volume = {37}, year = {1988}, pages = {351-362}, zbl = {0642.08002}, url = {http://dml.mathdoc.fr/item/GDZPPN001259474} }
Pöschel, Reinhard; Denecke, Klaus. A characterization of Sheffer functions by hyperidentities.. Semigroup forum, Tome 37 (1988) pp. 351-362. http://gdmltest.u-ga.fr/item/GDZPPN001259474/