JAMBOR, P. E. Radical of splitting ring extensions. MATHEMATICA SCANDINAVICA, [S. l.], v. 65, p. 50–58, 1989. DOI: 10.7146/math.scand.a-12264. Disponível em: https://www.mscand.dk/article/view/12264. Acesso em: 5 may. 2024.