Ammar, Aymen, Aref Jeribi, and Kamel Mahfoudhi. “Generalized Trace Pseudo-Spectrum of Matrix Pencils”. CUBO, A Mathematical Journal 21, no. 2 (August 10, 2019): 65–76. Accessed October 12, 2025. https://cubo.ufro.cl/index.php/cubo/article/view/2159.