Carrillo S. A., Hurtado M., Appell and Sheffer sequences: on their characterizations through functionals and examples. C. R. Mathématique (2021) 359(2) pp. 205-217 doi/10.5802/crmath.172
Carrillo S. A., Hurtado M., Appell and Sheffer sequences: on their characterizations through functionals and examples. C. R. Mathématique (2021) 359(2) pp. 205-217 doi/10.5802/crmath.172