UEDA, Yoshimichi. Remarks on free products with respect to non-tracial states. MATHEMATICA SCANDINAVICA, [S. l.], v. 88, n. 1, p. 111–125, 2001. DOI: 10.7146/math.scand.a-14317. Disponível em: https://tidsskrift.dk/math/article/view/14317. Acesso em: 14 aug. 2026.