Altinkaya, S., S. Kanas, and S. Yal¸cin. 2018. “Subclass of $k$-Uniformly Starlike Functions Defined by Symmetric $q$-Derivative Operator”. Ukrains’kyi Matematychnyi Zhurnal 70 (11): 1499-1510. https://umj.imath.kiev.ua/index.php/umj/article/view/1653.