AROV, D. Z.; ROZHENKO, N. A. Passive impedance systems with losses of scattering channels. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 59, n. 5, p. 618–649, 2007. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3335. Acesso em: 5 dec. 2025.