Aouf , M. K., T. Bulboacă, and T. Seoudy. “Integral Operators Preserving Subordination and Superordination for Multivalent Functions”. Ukrains’kyi Matematychnyi Zhurnal 73, no. 6 (June 18, 2021): 749 - 762. Accessed May 2, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/437.