KAMAL, A. A. M. $ \sigma $-derivations on prime near-rings. Tamkang Journal of Mathematics, [S. l.], v. 32, n. 2, p. 89-93, 2001. DOI: 10.5556/j.tkjm.32.2001.349. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/349. Acesso em: 26 may. 2022.