Arov DZ, Nudel'man AA. Criterion of unitary similarity of minimal passive scattering systems with a given transfer function. Ukr. Mat. Zhurn. [Internet]. 2000 Feb. 25 [cited 2025 Dec. 5];52(2):147-56. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4404