A. R. S. . Juma, A. . Al-Fayadh, and N. H. . Shehab, “Estimates of Coefficient for Certain Subclasses of k-Fold Symmetric Bi-Univalent Functions”, Iraqi Journal of Science, vol. 63, no. 5, pp. 2155–2163, May 2022, doi: 10.24996/ijs.2022.63.5.29.