AUZINGER, W. A note on similarity to contraction for stable $2 \times 2$ companion matrices. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 68, n. 3, p. 400–407, 2016. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1847. Acesso em: 6 dec. 2025.