ORHAN, Halit. Coefficient estimates in new subclasses of analytic and bi-univalent functions defined by the combinations of the $q$-derivative and the Sǎlǎgean derivative operator. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 78, n. 1-2, p. 88, 2026. DOI: 10.3842/umzh.v78i1-2.9261. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9261. Acesso em: 27 jan. 2026.