VASILESCU, F.-H. Spaces of fractions and positive functionals. Mathematica Scandinavica, Berkeley, CA, United States, v. 96, n. 2, p. 257–279, 2005. DOI: 10.7146/math.scand.a-14956. Disponível em: https://journals.msp.org/mscand/article/view/741. Acesso em: 24 jul. 2026.