Bedratyuk , L. P., and N. B. Lunio. “Derivations and Identities for the Chebyshev Polynomials”. Ukrains’kyi Matematychnyi Zhurnal 73, no. 8 (August 18, 2021): 1011–1022. Accessed April 27, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/2380.