El-Ityan, M., Tariq Al-Hawary, Suha Hammad and Basem Frasin 2025. A new subclass of bi-univalent functions of complex order defined by the symmetric q-derivative and subordination. Gulf Journal of Mathematics. 19, 2 (Apr. 2025), 111-120. DOI:https://doi.org/10.56947/gjom.v19i2.2649.