VYHOVS'KA, I. Yu.; ZELINSKII, Yu. B.; TKACHUK, M. V. On some criteria of convexity for compact sets. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 4, p. 466–471, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2732. Acesso em: 5 dec. 2025.