RAZA, M.; THOMAS, D. K.; RIAZ, A. Coefficient estimates for starlike and convex functions related to sigmoid functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 75, n. 5, p. 683–697, 2023. DOI: 10.37863/umzh.v75i5.7093. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7093. Acesso em: 5 dec. 2025.