HROD, A. I.; KUZHEL', S. A. Scattering Theory for 0-Perturbed $\mathcal{P}\mathcal{T}$ -Symmetric Operators. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 65, n. 8, p. 1059–1079, 2013. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2490. Acesso em: 5 dec. 2025.