Ben-Artzi, A., and I. C. Gohberg. “On Time Dependent Orthogonal Polynomials on the Unit Circle”. Ukrains’kyi Matematychnyi Zhurnal 46, no. 1-2 (February 25, 1994): 18–36. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5767.