Petunin , Yu. I., and V. I. Savkin. “Convergence, Brought to Life by Analytical Functionals, and Isomorphism of Analytical-Function Algebras”. Ukrains’kyi Matematychnyi Zhurnal 40, no. 6 (November 1, 1988): 799–803. Accessed December 6, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/9296.