POPOV, M. M. A property of convex basic sequences in $L_1$. Methods of Functional Analysis and Topology, [S. l.], v. 11, n. 4, p. 409–416, 2005. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/298. Acesso em: 16 dec. 2025.