GARCÍA-PLANAS, M. I.; KLYMCHUK, T. Structural stability of matrix pencils and of matrix pairs under contragredient equivalence. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 5, p. 706–709, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1468. Acesso em: 5 dec. 2025.