SHULMAN, V. S.; TUROWSKA, L. B. On the spectrum of multiplication operators. Methods of Functional Analysis and Topology, [S. l.], v. 24, n. 3, p. 265–274, 2018. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/700. Acesso em: 15 dec. 2025.