DovgosheiA. A. “Some Properties of Polynomials Orthogonal in a Space With ‘intermediate’ Topology. Kernel Function and Extremal Properties”. Ukrains’kyi Matematychnyi Zhurnal 45, no. 7 (July 25, 1993): 915–923. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5884.