MURPHY, J.; NICHOLS, R. Weak and vague convergence of spectral shift functions of one-dimensional Schrödinger operators with coupled boundary conditions. Methods of Functional Analysis and Topology, [S. l.], v. 23, n. 4, p. 378–403, 2017. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/678. Acesso em: 15 dec. 2025.