Sheremeta , M. M. “On the Gelfond – Leont’ev – Sǎlǎgean and Gelfond – Leont’ev – Ruscheweyh Operators and Analytic Continuation of Functions”. Ukrains’kyi Matematychnyi Zhurnal, vol. 74, no. 5, June 2022, pp. 717-24, https://doi.org/10.37863/umzh.v74i5.7058.