ARAZY, Jonathan. Isometries of Banach Algebras Satisfying the von Neumann Inequality. Mathematica Scandinavica, Berkeley, CA, United States, v. 74, p. 137–151, 1994. DOI: 10.7146/math.scand.a-12485. Disponível em: https://journals.msp.org/mscand/article/view/1143. Acesso em: 25 jul. 2026.