BUSLAEV, V. I. On a criterion of rationality for a series in orthogonal polynomials. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 8, p. 1139–1144, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2943. Acesso em: 14 apr. 2025.