AROV, D. Z.; NUDEL'MAN, A. A. Criterion of unitary similarity of minimal passive scattering systems with a given transfer function. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 52, n. 2, p. 147–156, 2000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4404. Acesso em: 5 dec. 2025.