DziokJ. “Classes of Harmonic Functions Defined by Extended Sălăgean Operator”. Ukrains’kyi Matematychnyi Zhurnal 73, no. 1 (January 22, 2021): 33 - 46. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/78.