DADASHOVA, I. B.; MAMEDKHANOV, J. I. On one theorem of G. Freud. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 11, p. 1578–1584, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1662. Acesso em: 5 dec. 2025.