GRONBAEK, N. Power factorization in Banach modules over commutative radical Banach algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 50, p. 123–134, 1982. DOI: 10.7146/math.scand.a-11949. Disponível em: https://www.mscand.dk/article/view/11949. Acesso em: 2 may. 2024.