POPESCU, G. Von Neumann inequality for $(B(\mathscr{H})^n)_1$. MATHEMATICA SCANDINAVICA, [S. l.], v. 68, p. 292–304, 1991. DOI: 10.7146/math.scand.a-12363. Disponível em: https://www.mscand.dk/article/view/12363. Acesso em: 11 apr. 2025.