ZHU, Z.; FANG, J.; SHI, R. On a class of operators in the hyperfinite $\mathrm{II}_1$ factor. MATHEMATICA SCANDINAVICA, [S. l.], v. 120, n. 2, p. 249–271, 2017. DOI: 10.7146/math.scand.a-25625. Disponível em: https://www.mscand.dk/article/view/25625. Acesso em: 22 jan. 2022.