BILALOV, B. T.; MURADOV, T. R. On equivalent bases in Banach spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 59, n. 4, p. 551–554, 2007. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3329. Acesso em: 5 dec. 2025.