On Skew Triangular Matrix Rings. Communications in Mathematical Research, [S. l.], v. 32, n. 3, p. 259–271, 2021. DOI: 10.13447/j.1674-5647.2016.03.08. Disponível em: https://global-sci.com/index.php/cmr/article/view/8896. Acesso em: 5 dec. 2025.