Rossdy M, Omar R, Soh SC. Bi-Univalent Function Classes Defined by Using an Einstein Function and a New Generalised Operator. sci. technol. indones. [Internet]. 2023 Apr. 15 [cited 2026 Jun. 20];8(2):195-204. Available from: https://sciencetechindonesia.com/index.php/jsti/article/view/619