Sheremeta M. M. On the Gelfond – Leont’ev – Sǎlǎgean and Gelfond – Leont’ev – Ruscheweyh operators and analytic continuation of functions. Ukrains’kyi Matematychnyi Zhurnal, v. 74, n. 5, p. 717 - 724, 17 Jun. 2022.