KADETS, M. I. On absolute, perfect, and unconditional convergences of double series in Banach spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 8, p. 1032–1041. August, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5098. Acesso em: 5 dec. 2025.