DUDʹEVA, G. S. On similarity of Volterra operators in Sobolev spaces. Methods of Functional Analysis and Topology, [S. l.], v. 5, n. 2, p. 1–11, 1999. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/84. Acesso em: 17 dec. 2025.