STØRMER, Erling. Separable states and positive maps II. Mathematica Scandinavica, Berkeley, CA, United States, v. 105, n. 2, p. 188–198, 2009. DOI: 10.7146/math.scand.a-15114. Disponível em: https://journals.msp.org/mscand/article/view/583. Acesso em: 24 jul. 2026.