Asymptotics for the ratio and the zeros of multiple Charlier polynomials. - François Ndayiragije; Walter Van Assche (J. Approx. Theory, 2012)

About families of orthogonal polynomials satisfying Heun's differential equation. - Alphonse P. Magnus; François Ndayiragije; André Ronveaux (J. Approx. Theory, 2021)