@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/