JAMBOR, Paul 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://tidsskrift.dk/math/article/view/12264. Acesso em: 13 aug. 2026.