LIN, H. Generalized Weyl-von Neumann Theorems (II). MATHEMATICA SCANDINAVICA, [S. l.], v. 77, p. 129–147, 1995. DOI: 10.7146/math.scand.a-12554. Disponível em: https://www.mscand.dk/article/view/12554. Acesso em: 9 may. 2024.