Cherneі N. I. Some theorems on stable convexity of closed curves under one-sheeted mappings. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 2, p. 276–280, 1971. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8515. Acesso em: 6 dec. 2025.