@article{Kuzhel’_1999, title={On a form of the scattering matrix for ρ-perturbations of an abstract wave equations}, volume={51}, url={https://umj.imath.kiev.ua/index.php/umj/article/view/4630}, abstractNote={We present the definition of ρ-perturbations of an abstract wave equation. As a special case, this definition involves perturbations with compact support for the classical wave equation. We construct the scattering matrix for equations of such a type.}, number={4}, journal={Ukrains’kyi Matematychnyi Zhurnal}, author={Kuzhel’S. A.}, year={1999}, month={Apr.}, pages={445–457} }