Hatamleh, R., and V. A. Zolotarev. “Jacobi Operators and Orthonormal Matrix-Valued Polynomials. II”. Ukrains’kyi Matematychnyi Zhurnal 69, no. 6 (June 25, 2017): 836–847. Accessed April 14, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/1738.