[1]
D. Z. Arov and A. A. Nudel'man, “Criterion of unitary similarity of minimal passive scattering systems with a given transfer function”, Ukr. Mat. Zhurn., vol. 52, no. 2, pp. 147–156, Feb. 2000, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4404