MUNCH, N. J. Relatively ’closable’ states on $C^*$-algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 57, p. 236–248, 1985. DOI: 10.7146/math.scand.a-12115. Disponível em: https://www.mscand.dk/article/view/12115. Acesso em: 29 apr. 2024.