Ferreira, José Claudinei, and Natally Rodrigues Silva. “About Eigenvalues ​​and Zeros of Polynomials and Optimization Problems: A Synthesis and Demonstrations”. Sigmae 8, no. 1 (August 19, 2019): 1–15. Accessed April 8, 2025. https://publicacoes.unifal-mg.edu.br/revistas/index.php/sigmae/article/view/637.