JANANI, T.; YALÇIN, S. Initial seven coefficient estimates for a subclass of bi-starlike functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 73, n. 11, p. 1576–1584, 2021. DOI: 10.37863/umzh.v73i11.1046. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1046. Acesso em: 5 dec. 2025.