KADETS, V. M.; POPOV, M. M. Some stability theorems on narrow operators acting in L₁ and C(K). Математическая физика, анализ, геометрия, Харків, Україна, v. 10, n. 1, p. 49–60, 2003. Disponível em: https://mag.ilt.kharkiv.ua/index.php/mag/article/view/m10-0049e. Acesso em: 23 лис. 2024.