Sheremeta M. M. “On the Gelfond – Leont’ev – Sǎlǎgean and Gelfond – Leont’ev – Ruscheweyh Operators and Analytic Continuation of Functions”. Ukrains’kyi Matematychnyi Zhurnal 74, no. 5 (June 17, 2022): 717 - 724. Accessed November 21, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/7058.