ArovD. Z., and Nudel’manA. A. “Criterion of Unitary Similarity of Minimal Passive Scattering Systems With a Given Transfer Function”. Ukrains’kyi Matematychnyi Zhurnal 52, no. 2 (February 25, 2000): 147-156. Accessed November 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4404.