KOTSUR, I. M.; KOTSUR, M. F. On the radii of convexity and starlikeness for some special classes of analytic functions in a disk. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 7, p. 954–958, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5268. Acesso em: 5 dec. 2025.