HNATYUK, Yu. V. Relative Chebyshev point of a system of continuously varying bounded closed sets. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 7, p. 889–903, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2773. Acesso em: 5 dec. 2025.