ZHANG, Y. Approximate complementation and its applications in studying ideals of Banach algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 92, n. 2, p. 301–308, 2003. DOI: 10.7146/math.scand.a-14407. Disponível em: https://www.mscand.dk/article/view/14407. Acesso em: 3 jul. 2024.