KUZHEL', S. A. Abstract Lax-Phillips scattering scheme for second-order operator-differential equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 4, p. 452–463, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5310. Acesso em: 5 dec. 2025.