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@article{SF_1988__37_1_134937, author = {Reinhard P\"oschel and Klaus Denecke}, title = {A characterization of {Sheffer} functions by hyperidentities.}, journal = {Semigroup forum}, pages = {351--362}, publisher = {mathdoc}, volume = {37}, number = {1}, year = {1988}, zbl = {0642.08002}, url = {http://geodesic.mathdoc.fr/item/SF_1988__37_1_134937/} }
Reinhard Pöschel; Klaus Denecke. A characterization of Sheffer functions by hyperidentities.. Semigroup forum, Tome 37 (1988) no. 1, pp. 351-362. http://geodesic.mathdoc.fr/item/SF_1988__37_1_134937/