1. Al-Salam, W.A.: Characterization theorems for orthogonal polynomials. In: Nevai, P. (ed.) Orthogonal Polynomials: Theory and Practice, NATO ASI Series, vol. 294, pp. 1–24. Kluwer, Dordrecht (1990)
2. Bouakkaz, H.: Les polynômes orthogonaux de Laguerre-Hahn de classe zéro. Thèse de l’Université Pierre et Marie Curie, Paris (1990)
3. Bouakkaz, H., Maroni, P.: Description des polynômes orthogonaux de Laguerre-Hahn de classe zéro. (French). In Orthogonal polynomials and their applications (Erice, 1990), IMACS Annals of Computational and Applied Mathematics, vol. 9, pp. 189–194. Baltzer, Basel (1991)
4. Chihara, T.S.: An Introduction to Orthogonal Polynomials. Gordon and Breach, New York (1978)
5. Drake, D.: The combinatorics of associated Hermite polynomials. Eur. J. Combin. 30(4), 1005–1021 (2009)