Characterizations of classical orthogonal polynomials on quadratic   lattices
  This paper is devoted to characterizations classical orthogonal polynomials on quadratic lattices by using a matrix approach. In this form we recover the Hahn, Geronimus, Tricomi and Bochner type characterizations of classical orthogonal polynomials on quadratic lattices. Moreover a new characterization is also presented. From the Bochner type characterization we derive the three-term recurrence relation coefficients for these polynomials. 
M. Njinkeu Sandjon, A. Branquinho, M. Foupouagnigni, I. Area
math.CA