W. Auzinger, “A note on similarity to contraction for stable $2 \times 2$ companion matrices”, Ukr. Mat. Zhurn., vol. 68, no. 3, pp. 400–407, Mar. 2016, Accessed: Dec. 15, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/1847