1. Another characterization of the classical orthogonal polynomials;Al-Salam;Siam J. Math. Anal.,1972
2. I. Area, E. Godoy, A. Ronveaux, A. Zarzo, Inversion problems in the q-Hahn tableau, J. Symbolic Comp. 28 (1999) 767–776.
3. An Introduction to Orthogonal Polynomials;Chihara,1978
4. M. Foupouagnigni, Laguerre–Hahn orthogonal polynomials with respect to the Hahn operator: fourth order difference equations for the rth associated and Laguerre–Freud equations for the recurrence coefficients, Ph.D. Dissertation, Université Nationale du Bénin, Porto-Novo, 1998.
5. Über Orthogonalpolynome, die q-Differenzengleichungen genügen;Hahn;Math. Nachr.,1949