E. Q. Assiri and M. L. Mogra, “A unified approach for univalent functions with negative coefficients using the Hadamard product”, Ukr. Mat. Zhurn., vol. 49, no. 9, pp. 1162–1170, Sep. 1997, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5113