Kuzhel’SA. On elements of the Lax-Phillips scattering scheme for $ρ$-perturbations of an abstract wave equation. Ukr. Mat. Zhurn. [Internet]. 1998Dec.25 [cited 2024Nov.24];50(12):1615–1629. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4781