-, .-. 3rd National Congress of mathematicians. Journal of Computer Science and Cybernetics, [S. l.], v. 1, n. 3, p. 32, 2015. DOI: 10.15625/1813-9663/1/3/6693. Disponível em: https://vjs.ac.vn/index.php/jcc/article/view/6693. Acesso em: 2 may. 2024.