I. Blahota, “On the Dirichlet Kernels with Respect to Certain Special Representative Product Systems”, Ukr. Mat. Zhurn., vol. 66, no. 11, pp. 1578–1584, Nov. 2014, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2247