LUKASHENKO, M.P. Rings with nilpotent derivations of index ≤ 2. Carpathian Mathematical Publications, [S. l.], v. 6, n. 1, p. 91–95, 2014. DOI: 10.15330/cmp.6.1.91-95. Disponível em: https://journals.pnu.edu.ua/index.php/cmp/article/view/1339. Acesso em: 22 apr. 2024.