STØRMER, Erling. A Decomposition Theorem for Positive Maps, and the Projection Onto a Spin Factor. Mathematica Scandinavica, Berkeley, CA, United States, v. 118, n. 1, p. 106–118, 2016. DOI: 10.7146/math.scand.a-23300. Disponível em: https://journals.msp.org/mscand/article/view/363. Acesso em: 24 jul. 2026.