BEREZANSKY, Yu. M.; DUDKIN, M. E. The direct and inverse spectral problems for the block Jacobi type unitary matrices. Methods of Functional Analysis and Topology, [S. l.], v. 11, n. 4, p. 327–345, 2005. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/291. Acesso em: 16 dec. 2025.