BABENKO, V. F.; TKACHENKO, M. E. Problem of uniqueness of an element of the best nonsymmetric L 1-approximation of continuous functions with values in KB -spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 7, p. 867 – 878, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3205. Acesso em: 14 apr. 2025.