Ammar, Boukhemis. “On the Classical 2−orthogonal Polynomials Sequences of Sheffer-Meixner Type”. CUBO, A Mathematical Journal 7, no. 2 (August 1, 2005): 39–55. Accessed January 19, 2026. https://cubo.ufro.cl/index.php/cubo/article/view/1541.