HOÀNG, V. H.; CHUYẾT, Đặng V. Some properties of the set T(e), a special subset of Z. Journal of Computer Science and Cybernetics, [S. l.], v. 25, n. 2, p. 159–165, 2012. DOI: 10.15625/1813-9663/25/2/573. Disponível em: https://vjs.ac.vn/index.php/jcc/article/view/573. Acesso em: 4 may. 2024.