Hamzat, Jamiu Olusegun, and Folorunso Isola Akinwale. “Bi-Univalent Condition Associated With the Modified Sigmoid Function”. Nepal Journal of Mathematical Sciences 3, no. 1 (August 31, 2022): 1–10. Accessed November 21, 2024. https://nepjol.info/index.php/njmathsci/article/view/44094.