Holubchak, O.M., and A.V. Zagorodnyuk. βOn Bidual Bases in the Space of Symmetric Analytic Functions on $\ell_1$β. Carpathian Mathematical Publications 5, no. 1 (June 20, 2013): 47β49. Accessed April 7, 2025. https://journals.pnu.edu.ua/index.php/cmp/article/view/3649.