Orhan, Halit. “Coefficient Estimates in New Subclasses of Analytic and Bi-Univalent Functions Defined by the Combinations of the $q$-Derivative and the Sǎlǎgean Derivative Operator”. Ukrains’kyi Matematychnyi Zhurnal, vol. 78, no. 1-2, Jan. 2026, p. 88, https://doi.org/10.3842/umzh.v78i1-2.9261.