M. E. Dudkin, “An exact inner structure of the block Jacobi-type unitary matrices connected with the corresponding direct and inverse spectral problems”, MFAT, vol. 14, no. 2, pp. 168–176, Jun. 2008, Accessed: Dec. 17, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/380