Vasylyshyn, T.V. “Description of Spectra and Derivations of Wiener Type Algebras of Functions Generated by $(p,q)$-Polynomials on Banach Spaces”. Carpathian Mathematical Publications 4, no. 2 (December 27, 2012): 212–228. Accessed July 21, 2024. https://journals.pnu.edu.ua/index.php/cmp/article/view/2157.