1. Akhiezer [Achieser], N.I.: The Classical Moment Problem. Oliver and Boyd, Edinburgh (1969) (originally published, Moscow, 1961)
2. Akhiezer, N.I.: Elements of the Theory of Elliptic Functions, 2nd edn. Nauka, Moscow (1970). Translations Math. Monographs, vol. 79. AMS, Providence (1990)
3. Álvarez-Nodarse, R., Marcellán, F.: Difference equation for modifications of Meixner polynomials. J. Math. Anal. Appl. 194, 250–258 (1995)
4. Aptekarev, A.I., Branquinho, A., Marcellan, F.: Toda-type differential equations for the recurrence coefficients of orthogonal polynomials and Freud transformation. J. Comput. Appl. Math. 78(1), 139–160 (1997)
5. Annals of Computing and Applied Mathematics;R. Askey,1991