“Second Hankel Determinants and Fekete-Szegö Inequalities for Some Sub-Classes of Bi-Univalent Functions with Respect to Symmetric and Conjugate Points Related to a Shell Shaped Region”, ATA, vol. 34, no. 4, pp. 358–373, Nov. 2018, doi: 10.4208/ata.OA-2017-0020.