LIN, Huaxin. Generalized Weyl-von Neumann Theorems (II). Mathematica Scandinavica, Berkeley, CA, United States, v. 77, p. 129–147, 1995. DOI: 10.7146/math.scand.a-12554. Disponível em: https://journals.msp.org/mscand/article/view/1114. Acesso em: 25 jul. 2026.