HOPENWASSER, A. Isometries on Irreducible Triangular Operator Algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 30, p. 136–140, 1972. DOI: 10.7146/math.scand.a-11069. Disponível em: https://www.mscand.dk/article/view/11069. Acesso em: 24 nov. 2024.