H. Bavinck et R. Koekoek, ON A DIFFERENCE EQUATION FOR GENERALIZATIONS OF CHARLIER POLYNOMIALS, Journal of approximation theory, 81(2), 1995, pp. 195-206
In this paper we obtain a set of polynomials which are orthogonal with
respect to the classical discrete weight function of the Charlier pol
ynomials at which an extra point mass at x = 0 is added. We construct
a difference operator of infinite order for which these new discrete o
rthogonal polynomials are eigenfunctions. (C) 1995 Academic Press, Inc
.