DEREVYAGIN, M. S. Borg-type theorems for generalized Jacobi matrices and trace formulas. Methods of Functional Analysis and Topology, [S. l.], v. 12, n. 3, p. 220–233, 2006. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/315. Acesso em: 16 dec. 2025.