KUZHEL', S. A.; MATSYUK, L. V. On an Application of the Lax-Phillips Scattering Approach in the Theory of Singular Perturbations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 5, p. 679–688, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3634. Acesso em: 5 dec. 2025.