P.C, W.; K.B2, W. On Residual Properties of Nilpotent Groups. Malaysian Journal of Science, [S. l.], v. 24, n. 2, p. 133–138, 2005. Disponível em: https://ejournal.um.edu.my/index.php/MJS/article/view/8370. Acesso em: 7 apr. 2025.