TEAM, S. Nonderogatory of Sum and Product of Doubly Companion Matrices: Wiwat Wanicharpichat. Thai Journal of Mathematics, [S. l.], v. 9, n. 2, p. 361–372, 2011. Disponível em: https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/269. Acesso em: 2 may. 2024.