KUZHEL', S. A. On the inverse problem for perturbations of an abstract wave equation in the Lax-Phillips scattering scheme. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 52, n. 5, p. 638–647, 2000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4458. Acesso em: 7 apr. 2025.