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 78, no. 1-2 (January 26, 2026): 88. Accessed January 27, 2026. https://umj.imath.kiev.ua/index.php/umj/article/view/9261.