Kaczorek, Tadeusz, and Kamil Borawski. “Positivity and Cyclicity of Descriptor Electrical Circuits With Chain Structure”. Bulletin of the Polish Academy of Sciences Technical Sciences 70, no. 1 (January 3, 2022): e139955. Accessed October 20, 2026. https://wydawnictwo.pan.pl/index.php/bpasts/article/view/7629.