STØRMER, E. A Decomposition Theorem for Positive Maps, and the Projection Onto a Spin Factor. MATHEMATICA SCANDINAVICA, [S. l.], v. 118, n. 1, p. 106–118, 2016. DOI: 10.7146/math.scand.a-23300. Disponível em: https://www.mscand.dk/article/view/23300. Acesso em: 28 mar. 2024.