M. I. García-Planas and T. Klymchuk, “Structural stability of matrix pencils and of matrix pairs under contragredient equivalence”, Ukr. Mat. Zhurn., vol. 71, no. 5, pp. 706–709, May 2019, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/1468